Well, perhaps not, but I am sure it certainly helps. I've never heard of a single instance of an atheist seeing God. However, I know of the opposite sometimes happening. The best recorded instance of this is probably Mother Teresa. Toward the end of her career she lost all sense of the presence of God in her life and began questioning his existence.
For instance, my point would be that if you look to the very existence of life as evidence of God, it helps if you already believe in God. Atheists won't see life as evidence for God.