Salaam again,
Today I am going back on my divine mission, but since I felt a bit provoked I had to reply. What I received as a reply was not entirely accurate to the Truth.
What I want to start to say is, the word Muslim does not translate into Believer, this word means something else. The word Muslim means something like someone who submits to God, or some say Peacemaker because it comes from the same root as S L M which gives the greeting Salaam. This word is not used as a name of a religion, but as a way of coming to peace of mind.
As far as I am concerned, the Arabic word mu'min is the word for Believer, so in that sense I can call myself 'Mu'min' then if I would like to tell my faith in Arabic, but this does not place me in one folder, I could belong to any sect in the world, as long as they worship God alone. This is what God meant when He said that we should not break into sects, but this is unfortunately what keeps happening.
I do not like to call people wrong, but I would like to object on this about Muslims are necessarily people who specifically follow the Quran, even those who followed the teachings of Jesus in a proper way (being monotheists) were also Muslims, being Muslim means to follow the same Message as both Jesus and Muhammad carried about being peaceful and friendly, the whole "religion" tells you to be making peace with both yourself and others. God hints at this thing about calling yourself Muslim in the Quran, where he says you should not call yourselves Muslims but Believers, it could have been that people had the same issue those 1400 years ago. If you truly believe and you are certain at heart it is more appropriate to refer to yourself as a Believer.
Well, i hope you enjoy your trip. But it seems from your background that you are not a first language Arabic speaker, as you stated the meanings and the root words of both Muslim and Momin wrong. And I state the following to expand your Arabic knowledge, as many out there are not aware of the classical Arabic literature.
The word Muslim is derived from the word Islam, and with the word Islam, the focus is on the letters Seen- Lam- Meem. Following is a detailed description of the various scholars and the linguists.
All the basic meanings are taken from Moheet, Taj and Lane; these are eight in number-
Salema means he got purified from all the defects, shortcomings; all the shortcomings are complemented. Verse (Quran verse 2/71) refers to the cow that is perfect and without any defect, so its basic meanings are to get well and perfect, complete in all respects so that no defect remains.
To remain safe from all dangers, accidents, mishaps. Ibn-e-Faris says that its basic meanings are more inclined towards perfection in health, safety and security. As-Sal'am is also one of the names of Allah used in the Quran (59/23) which means free from all defects and shortcomings and who faces no danger from anything. The author of Taj-ul-Urus, however, disagrees with this and says that Sal'amun means someone from whom safety and security is sought. Sal'am is one of the names of Allah, as He has kept the entire creation safe from all catastrophes and His System and Laws are in operation with perfection.
As-Sullamu means a ladder used to reach some high place and is safe and dependable. So the third meanings are the ways and means by which someone can reach the heights with confidence.
As-Silmu (2/20 means one who lives with peace and order and also maintains peace and order. Tasalamat-il-Khailo means horses who march in step; no horse creates any trouble or mischief - all are in one step. This explains the Islamic System. As-Silmu-wa-As-Salamu means to be obedient, to bow, to surrender. So the fifth basic meanings are to bow to and obey the Laws of Allah in totality. Nawab Siddique Hasan Khan writes that the basic meanings contain the element of humility and softness.
Is-Taslama Sakamat-Tareeq means one who walked in the middle of the path and did not deviate from it. Qaloo Salama means who leads or takes up the middle path, does not look either side and avoids obscene things or lewdness. So the sixth meanings of this root are to adopt a balanced way and avoid obscenities, filthiness, indecency, and immodesty.
Is-Talam-az-Zaru means the crop has ripened. So the seventh meanings of this root are a system under which efforts bear fruit. As-Salimatu is a woman whose hands, feet and limbs are soft, beautiful and in perfect shape. So the eighth meanings of this root are beauty and elegance.
To sum up, Al-Islam means a system or code of life which-
Removes all the shortcomings of a person and enables him to develop all his potentialities.
Safeguards him from all the dangers, catastrophes and degradations of life, and
marches him on towards higher evolutionary stages of life. Enables not only himself to lead a peaceful life but also helps maintain peace and order around him and in the whole world.
Trains him to live in harmony among other fellow beings and not to commit any act by which someone else gets enraged or upset.
So like you said the "peacemaker" but by following ONLY Quran alone. (and using knowledge, 'ilm' to help consolidate the Quranic views/ Islamic social order).
So Islam is that code of life which has been revealed by Allah for the mankind. There is no other code acceptable to Him. In Surah 'Ale-Imran (3), verse 82, Quran says, "Do those people desire some different Deen than the one ordained by Allah?" At another place, "Whereas whatever is there in the universe follows the way which leads to the goal set for them by Allah" (13/15). At yet another place, "If someone adopts a way other than this, it will not be acceptable and in the end he will be the loser" (3/84). This is the Code which was revealed to various Anbia from time to time and its final and complete form to Rasool Allah (peace be upon him) and this code has been selected for the entire mankind. This code of life has been named Al-Islam and the followers of this Code are called Muslimeen. A Muslim is he, who accepts the Holy Quran as the one and only, complete and final Code revealed by Allah for the mankind.
NOW as for the word "Momin". It actually originates from the word "Aman". Ask any Urdu/ Sanskrit speakers and they will reassure you that Aman means "Peace". Thus Momin is a person who practices peace in Sub-continental language. You may argue that it is not Arabic, thus I will give you the Quran word "Ei'man" from which the word Momin is derived from. The root word for Eiman are Alif- Meem- Noon.
Amnun means peace, safety, state of mind where one feels safe from fear or danger (2/24). Also when one feels safe, secure and at peace. Ibn-e-Faris says that its basic meanings are-
Peace of mind. To testify. The opposite of dishonesty.
Amana is to satisfy someone and put him at ease without fear, to provide peace or protection to someone, to take over the responsibilities of someone's protection (Taj).
Aitimanun is to trust someone, have confidence on someone, take someone as trustee or protector (Taj).
Naq'atun Amoon is a she-camel which is dependable by virtue of her qualities and can take one through the journey without getting weak or falling down after stumbling (Taj).
Momin is one who stands guarantee for peace, upon whom one can depend, rely and then rest at peace, one who guarantee international peace (Taj).
Amanat is something which is entrusted to someone (Moheet).
Ameen is one who is contended, at peace, trustworthy, reliable, dependable.
Baladun Ameen is a city where peace and security prevails (Makkah)(95/3).
Muqamun Ameen is a place which provides adequate provisions of protection and security (44/52).
To declare Ei'man, therefore, means-
To believe, admit, accept or not to reject.
To testify the truthfulness, not to contradict.
To have confidence, reliance, trust.
To accept, to obey, to bow in obedience.
According to the Holy Quran, Ei'man on the following five fundamental entities is needed in order to become a Momin (2/177)-
The Allah.
The Law of Mukaf'at and the life Hereafter.
The Malaika.
The revealed Books.
The Anbia.
And Momin is one who accepts the truth and acts in such a way that it ensures his own peace and helps him to safeguard the peace and security of the rest of mankind. Indeed, Al-Momin is one of the most important Attributes of Allah Himself.
Personally I wouldn't call myself a "Momin" simply because Momin is an attribute to Allah and also because I do not believe I have done enough good deeds to achieve a status like that of Momin. Thus, I simply call myself a Muslim, i.e a follower of Islam and its holy book Quran.
Umm... I sort of have a feeling, you also believe that "Malaika" means "Angels" and "Shaitan" means the "Devil"...? Yes?... Even though, the both concepts Angels and Shaitan are neither Islamic and nor rational. And certainly derived from the Christian concepts of Angels and Satan. Will discuss further, if you are interested. In my understanding, not only the word Muslim translates as the follower of Islam and Quran, but also as a Believer of the guidelines of the Quran. You tend to put the the term "believer" in a more generic form.
I still do not understand which religion you identify yourself as on your passport. My guess is still "Other".