That's your theory, but the evidence doesn't point at that. We have the testimonies of people claiming to talk and to speak with God, not even the writers of the Bible but even of saints today and in the past, so why wouldn't you believe them? You have no evidence that they were under drugs or smart people lying so they can get... wait, what exactly? What do they get? Nothing, so you just call them smart people lying, what's the evidence for that? Just because you don't believe them it doesn't make them liars, just because what happened to them can't fit into your biased brain it doesn't mean it isn't truth.