I think it may be based on insecurity and a feeling of vulnerability, even without logic or reasoning the omnipotent one will serve to protect it's followers in their darkest hours, I also believe that religious folk come in 2 flavours, the first I have mentioned above and the second are those who see religion as a way to enrich their lives with control, wealth and sexual deviancy in a business that takes money from the poor and uneducated in return for hope and false protection against evil, having said that The business model of religion is very impressive, they pay no tax, they hold no tangible products, they pay no rent, marketing is free by way of indoctrination of the young and vulnerable and labour and goodwill are donated, that's a pretty solid business plan.

Fear, boredom inability to practice critical thinking (for various reasons) and being indoctrinated in childhood.

There is no heaven or afterlife for broken down computers; that is a fairy story for people afraid of the dark.”

Why do people insist on believing in a magical God?

Because believing in a non magical god is to far even for them....except for Trump...never mind.

It's because people can be extrodinaraly stupid.

Supreme beings answer the unknowable. Supreme beings coupled with an afterlife address the fear of death and non-existence.

I suppose believing in an afterlife makes them feel better about their life now. I would have no problem with that if theists would leave me in peace with my lack of beliefs and not try to 'save' me

I don't know why so many need make believe when there is so much wonder right here:
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That's how evolution made us.

I guess I never thought reality was bland. Maybe that's why I never felt the need to believe in something that doesn't exist.

For one thing you can be a shitty person and go to church and pray and you're forgiven and you can be a shitty person next week. Rinse, repeat.

Because they can, and if it brings them comfort or meaning or purpose, good for them!