Life's riddles and miracles
I once read of an atheistic man (an ophthalmologist, by the way) who became a believer by simply being intellectually honest enough to consider a few irrefutable facts.
Namely: the “Law of Cause and Effect,” which says, “Something (the universe, etc.) is, so evidently something or someone has always been.”
The ophthalmologist became convinced, however, by merely gazing into the eyes of his 2-year-old daughter.