Once you start speaking of "reality" as if it were personal, you cheapen and devalue the meaning and usefulness of the word, as if it meant nothing more than "perspective".
While it can be dismissed as just an assumption (since I can't prove, for example, that you're even real, and not just a figment of my imagination -- and vice versa) that there is a shared reality of objective facts which are true for all people, it is a very powerful and useful assumption. Shared reality is implicit in the concept of communication. If we can assume no common ground, we cannot assume any possibility of meaningful communication.
Do I have faith in your intelligence to determine "your" reality? Frankly no, I do not.
That doesn't mean I'm calling you stupid, however. Intelligent people still make lots of mistakes. I merely don't think you're applying your intelligence very well on this particular issue if you don't consider the very, very common human failings of confirmation bias, emotional bias, delusion, etc., when you evaluate your supposed "direct experience" of things. You don't have to be crazy or stupid to believe things that aren't true -- people the world over do it all the time. There are psychological tests that show how very easy it is to make ordinary people firmly believe things that just aren't so.
The problem with granting everyone faith in determining their reality is that there's too much contradiction to be found that way. People who earnestly proclaim FAITH in all manner of things come up with not only a wide variety of supposed realities, but often mutually incompatible realities. The old
"blind men and the elephant" story is not sufficient to explain away the many contradictions of various faiths. Somebody proclaiming faith has to be wrong, and if somebody has to be wrong, why not most or all being wrong, when none of them can present good evidence for their claims?
If you (a hypothetical, for-example "you") claim "faith" leads you to believe in spiritual advancement and punishment via reincarnation, and another person claims salvation is found solely through Jesus, can I really give both of you the benefit of the doubt that you're both correct? When the two of you die, what happens to you? Do you both get what you want in the next life, but find the other person has escaped the fate you thought would be theirs? Is there a copy of you that comes back as a cow (for some, this is supposedly a great thing) and another copy burning in a lake of fire in that other guy's reality? Does the other guy get into heaven while simultaneously living a parallel life in your reality as a parrot or a dung beetle?