A simple understanding of ths problem is that a person can't be made to believe anything that he cannot "see," or somehow otherwise sense and accept. On one level, that's certainly true. If I've never seen Santa Claus, and have been given all kinds of evidence that Santa Claus is nothing more than a charming fiction, then I certainly cannot be made to believe that the jolly old elf actually exists.

On another level, however, after living through a process of doubt and questioning and settling into a stance of profound agnosticism ~ when a person comes to the realization that neither the existence not the nonexistence of a God can be proven to one's satisfaction ~ it is possible for one to simply decide to believe, to decide to live one's life in the light of faith and hope, not in the shadow of doubt and cynicism.

A good first step is to discard all earlier notions of what God is, while remaining open to entirely new ideas of what God might be.

I suppose that you, like me, find it impossible to believe in a God who is a white-bearded old man floating on a cloud, kinda like Santa Claus except meaner. Anything you've ever been told about God that you find unbelievable, simply discard every such notion. If you can't believe in a creator who is essentially a grouchy old man, don't believe in that notion of God, but keep the door of your mind open to belief in another, more plausible and more sophisticated vision of the Divine. If you find it impossible to believe in a Supreme Being who makes everything easy and right for you, by all means reject belief in that very superficial notion of God, too, but reserve judgement on the existence of a God whose ways are beyond your understanding.