Yes people do tend to follow what they are surrounded by but that was not the argument I made nor does it say anything about whether any religion is true or not.
They do more than just follow culture. They are created by it. It constitutes the boundaries of their reality. It provides the language, the modes of thought, the values, and all other notions of truth they use to see the world through. It provides their eyes. It's vastly more than a matter of following. It conditions our perspectives on everything.
Your confusing epistemology (how we come to know of a thing) with ontology (what the nature of the things actually is).
No I'm not. I'm saying the nature of what things "actually" are is conditioned by our programming. You can't know how things "really are" except through those filters which subsequently colorize it as a reflection of that culture. Unless you can claim to have transcended those, but I sincerely doubt you legitimately can, since you are using them to make your case for what you think that truth is.
So the nature of a religion is unrelated to why or how we come to believe in it.
It absolutely is related. Humans create God in their own image. Why do you think there are so many images of God out there, including yours? You assume yours is not a projection, and only theirs are? You might wish to think about that very special position that just happens to be the one you happened upon. It's really hard to defend that.
The nature of a God based religion should hold complete sovereignty over it's followers.
First of all, all religions are "God based" in one fashion or another. Secondly however, that a religion should hold "complete sovereignty" over it's followers sounds like a recipe for a dangerous cult, not a "true religion". A true religion allows the exploration of truth and meaning. It's not a dictatorship. That is the opposite of a religion of the heart. Is your religion a dictatorship?
IOW if a person has faith in a religion, he should submit himself to it rather than the other way around, regardless of how he came to believe in it.
Oh dear, that's a problem. Again, that sounds like a cult. I have faith in God, not a religion. Religions are created by humans. Faith is created by God.
Despite the fact that most people are heavily influenced by their faith, I find Christians to be the most scrutinizing of people.
Not in my experience. I find the sort you're talking about the most in denial of truth, not facing change, but making every excuse in the world to not face it, and calling that "faith". I find it tragic on the deepest levels. Not praiseworthy at all.
Unlike Islam there is no potential death penalty for question our faith, and entire libraries are filled with professional argumentation concerning the faith.
If you ignore the Grand Inquisition, you might have an argument. Also, if you ignore "disfellowshipping", and if you ignore shunning, disowning, excommunication, and all the other things that goes along with Christians who don't toe the line.
I am short on time or I would list the many ways that Christianity is more resistant to cultural collusion compared to most faiths, sufficient to say for now that the bible is the most scrutinized book ever written.
Oh goodness, Christianity is totally morphed and shaped by culture throughout the ages!