Are you conflating the stock market with god? The stock market is not a “thing” in the same way that math is not a “thing”. God, or at the very least the christian god, is an actual being that supposedly exists and wants everyone to know it.
They’re not even remotely similar.
Edit: also, you know, we can actually interact with the stock market.
Its worth noting that most of these people were indoctrinated into their beliefs since they were born, and many of them attend church weekly to reaffirm their beliefs. They were raised surrounded by christians, were told christianity is true, and think that if you question god you will be consciously tortured for eternity. They’re not just a bunch of idiots.