As he entered his four-year-old son Jon's room, long-time atheist Chet Galaska said his first genuine prayer in decades, and told God that if Jon wanted to read The Golden Book About God instead of P.J. Funnybunny, the book he'd requested for weeks, he would believe in Him again.   Jon had "P.J." in his hands, put it on his bed, walked over to the bookcase, pulled out the "God" book, and handed it to him.  "I want to read this tonight," he said.   The journey back to belief had begun. FINDING FAITH IN A SKEPTICAL WORLD  is a primer for skeptics, seekers and Christians   Finding Faith  helps non-Christians easily grasp Christian concepts.  The hope is they'll realize there's more to to faith than they ever thought - and they'll take a huge step: opening their minds.  And once they do, that they'll tap into the strength and hope Christianity offers.   Christian readers find it reinforces their faith and enables them to more confidently discuss it with others.