@civic and I had a discussion about that today. I'm curious from a psychological point of view how even intelligent people, as you say, can fall for Calvinism. Civic and I think that they are projecting their understanding of reality (from their life experiences) unto their version of God. For example, if they grew up in an environment of severe insecurity then they will thirst for a God that controls everything. If they want to hang on to their thirst for vengeance, because of what happened to them in their lives, then they will follow a god that demands retribution like PSA. If they lost respect for any human intelligence (other than fellow Calvinists) then they will follow a god that belittles everyone that doesn't think like them. That way they feel justified in launching all their insulting ad hom comments at any time of their choosing.The problem is when people fall for the lie and have it stuck in their minds they give tunnel vision and that's all they see. No matter what you say, what scripture you post, how good of a theologian you are, what logic you use, they're not going to consider any of it.
I find it amazing the Civic was able to leave Calvinism behind especially after all the years he was a Calvinist. I've only met a few people that have been fortunate enough to do that.
One thing I've learned is that if you have a good understanding of Calvinism and try to explain it to your everyday run of the mill Christian they have a hard time understanding how anybody could fall for that.
I have a hard time understanding how anyone as sharp as RC Sproul or John MacArthur, John Piper could fall for Calvinism.
It's very much like what the ancient Greeks did with their pagan gods when they formed their gods based on what they saw around them: jealousy, power struggles, infidelity, etc... The Greeks were not as insecure nor as vengeful as Calvinists. They were more into power struggles and soap opera relationships.