Repeating the same message over and over again, day after day after day indoctrinates the speaker to that message. Again, this is true for ALL HUMANS.
The only message one can reliably say that all Muslims agree on is that the Qur'an is God's word and Muhammad is his messenger. All other parts of the religion have been subject to interpretation for over a millennium, hence the existence of various sects (that sometimes severely clash with one another).
Fair enough "how they think" was poorly put on my part. But I think "what they think" is on the mark.
As for different interpretations, of course that's true up to a point. But the Quran is extremely repetitive on some main themes and those main themes will make into the minds of ANYONE who hears them over and over again. Over the years I've participated in and read countless debates on interpreting the Quran. What theologians and scholars almost always whiff on is that the parsimonious messages are the ones that get thru to the listener. so you can go on and on about your scholarly interpretation of the text, and that is a legitimate thing to study. But it is separate from what happens in the brains and minds of Muslims who hear the words over and over again throughout their lives.
I still don't see anything in the above that is unique to Muslims or that they're more susceptible to than any other religious or ideological group that includes hundreds of millions or billions of people. There are millions of Muslims who live in the same country and hear the same messages but still end up acting, believing, and speaking differently, Lebanon being one example with its large diversity of Islamic sects among its Muslim population. Even among members of the same sects or other religious and ideological groupings, there's usually a lot of variation in how individuals act, and that's something that applies to all other religions and also to irreligious worldviews.