I'm sorry for the late relpy...
About your claim that it's not necessary that only Muslims can gain salvation, I didn't say anything because I had no knowledge. But I came across a verse recently so I thought I'd share it on the forum so please let me know what you think 
If anyone desires a religion other than Islam (submission to Allah), never will it be accepted of him; and in the Hereafter He will be in the ranks of those who have lost (All spiritual good).
(The Holy Quran, Al-e-Imran 385)
Secondly, Bro Wakas, only God knows whats in the hearts of each one of us but honestly, there are six billion people living in the world and there millions of sects, beliefs and ideology. Of course, there are loads of people who deceive and have false agendas but I strongly believe, and I know for sure that each group of people will definitely have followers who have sincerely searched and have come to the conclusion that they have the truth. There's always a chance that they're missing out somewhere, but I'm sure that in every group of people there always those who do try their best.
I know it makes no sense for me to say this because obviously, as far as any of you reading is considered, I could be lying but I personally do believe that as much as I know, I've cleared my mind of prejudices and biases and I really am searching for the truth with all my heart, and I've never rejected anything out of blindness and arrogance. I really don't know for sure what the truth is, I can only hope to be guided. What I'm trying to say is that I'm sure there are so many others just like me but with different beliefs, backgrounds, and in-built mindsets!