If I believe in God and He exists, I’ve gained everything. If I believe in God and He doesn’t exist, I’ve lost nothing. If I disbelieve, and He does exist, I’ve lost everything. Therefore, a rational person who has any doubt should take the leap of faith just in case. I don’t know when I first heard about Pascal’s Wager, the argument for believing in God based on possible outcomes. It went on to be an enormous part of my training to defend Christianity in a secular and hostile culture and be ready always to give an apologia for the hope within me.