God exists in all people's mind. Because, our existence is the result of God's creation. It is one kind of belief of people's mind.
It seems to me that belief in God is a mental illness. As an educated person can believe in something that cannot be proven? Moreover, almost all that is said in the Bible is a fairy tale.
Maybe you're wrong. Man must believe in something. God is not a person or something material, it's hard to explain. You have in your life probably was not a situation where you are reminded of the faith. Perhaps still ahead.