Is God really everywhere?

Well, yes I believe God is really everywhere and I also believe I'd have the same faith and religious belief if I was born and raised in another place:)
Because I believe God Has plans for me even before I was born, so even if I was born in somewhere else, I'd go through the same way
Of course I respect other people's opinions about that, but that's what I believe

Many people believe in God,but most Chinese and Hindus believe in Buddha. Muslims are not common in some countries. So I think people's religious befief is affected by the their education, custom and living evironment. That's why people from different countries tend to have differnt faith and religious belief. As a result, if one were born and raised in another place, he/she might have a different faith, the one which is common in the place he/she was raised.

i am not sure, because circumances will shape your mind view, so i can't answer it

Yes, faith does not depend on the place where you are born.
In India there is a saying taht "If you believe a stone to be a god, it is a God else it is just a stone".

Yes, I think that the belief was born and where no direct relationship, the majority are acquired beliefs formed.