Salam alaikum. This is a personal question for you, brother. How do you hold onto your belief so firm and sincerely? Do you rely not only to your strong reasoning, but also your intuition to trust the information you gather and the knowledge you have?
Alaikumassalam wa rahmatullah,
I believe our souls have the power to recognize God and to feel His presence. As I write this, all it takes is a tiny bit of effort and I feel God. A connection is established. I believe people lose this ability due to starting to dislike God after suffering losses and hardships. It is a grudge that closes their hearts so that they start to refuse to face God, always refusing to look into that place in their soul where the connection is.
Islam enables me to channel this connection in the right direction, but it is not essential to it. The connection is always there regardless of any thinking. But if I ever rationally doubt Islam, all it takes is reading a few pages of the Quran and all my doubts go away. Reading it, on every page I run into a few verses that clearly could not have been written by a human. It is as if someone wrote a passage that deserves a Nobel Prize in Literature, and did it not just once, but over and over again across 600 pages.