Hello brothers and sisters. Peace be upon everybody. My first question is where in the Koran is it written that you should perform salat in Arabic the way every Muslim performs nowadays and who performed it first and suggested whats to be said in it. If Muhammad performed it then why would he say this at the end of the prayer? Or is it suggested by people.

"O Allah, bless our Muhammad and the people of Muhammad;
As you have blessed Abraham and the people of Abraham.
Surely you are the Praiseworthy, the Glorious.
O Allah, be gracious unto Muhammad and the people of Muhammad"

What about Jesus, Moses and all other prophets? What about the rest of 80% population of people? Arent they Gods creation too? They are more successful, well mannered and clean then Muslims. Doesnt this prove that muslims are calling Muhammad the partner of God. Every muslim says this in his/her prayer, if god wanted it this way he wouldve surely blessed Muslims. Why do we have to face the Kabba? Doesnt this also prove that basically they are worshipping Kabba and Arabic language. Where is the love and rememberance of God? When a person is born he is forced to learn the Quran in Arabic by heart without even translating it, instead they should first let them learn the meaning behind it. They brainwash all the people by telling them to do salat in Arabic or else go to hell. Muslim perform the Arabic Salat 5 times a day and treat everyone with dishonesty, injustice, cheating and hatred. They think God loves them and by doing such they'll go to heaven but they fail to realize is what theyre doing is wrong and god doesnt like the hypocrite person instead it will take them to Hell. Guess what Satans hard at work. Tell me how can a non-Muslim embrace this horrible act? Theyre not to be blamed. I can only pray God lead them to the right direction.
I dont know what to say, the only thing thats right to me is Koran because its never changed. Sometimes im suspicious about Koran aswell because of so much hatred and violence shown towards non-muslims. My last question is whats everyones opinion about Salat according to Koran, what should we say in Salat? How many times? And do we really have to face the Kabba which is ridiculous? What does the Koran say about it?
Thank you