Any belief that requires great effort to maintain isn't worth believing and is probably untrue.
Do you have to work to maintain your belief in the existence of air, gravity, electricity? No, because these phenomena are all provably true.
In the same way, if God's existence were provably true then no effort would be required to maintain belief in him and the prospect of losing faith in him would be as ridiculous as the prospect of losing faith in the existence of air, gravity and electricity.
It is precisely because the existence of God is a very weak concept founded in wishful thinking, and devoid of substantive evidence, that religions have devised notions like the need for faith; studying and meditating on religious literature to strengthen and maintain faith; and avoiding information that has the potential to undermine faith, i.e. logically expose the beliefs as being unfounded and without merit.
No God of love and wisdom worth worshiping would create this kind of scenario where the idea of his existence can only be supported by wishful thinking and logical fallacies; and at the same time his "inspired" writings are contradicted by verifiable scientific evidence