What is needed to combat the overwhelming level of belief in God?

[Edwardo Piet]

But their 'own time and their own reasons' doesn't really mean anything. You are, essentially, a product of your environment. You can't have any ideas in an intellectual vacuum.

You're kind of being a greedy reductionist there though. You're kind of explaining away everything with the word "environment" when of course within that it's all full of lots of details.

https://en.wikipedia.org/wiki/Greedy_reductionism

It's like saying a painting is "nothing but paint and brushstrokes", technically true but your answer kind of leaves our all the meaning.

Yes what you are saying is essentially true, but you know what I mean: You can't argue people out of their faith.