You seem to be confusing faith in religious doctrine written by man with faith in God. The muslims have faith in their doctrine of hate and destruction rather than pure faith in God. Doctrine does not validate faith in God, faith alone establishes our bond with God.
My proposition is that belief in scientific theory and faith in God are different things, though belief is used as a synonym.
I haven’t touched doctrinal differences, they belong in a different thread.
But, just to juice the conversation, there is a wide spectrum of Muslim doctrine - nowhere near as large as the spectrum of Christians, but still significant.
Whether Muslims, or Christians, or whatever you may label someone, has true faith, I leave to God.