What about Hindu religion? They don't share the same god. What about atheists? They don't believe in any god.
How about instead of saying a Christian prayer we show sportsmanship in a way we've all agreed on. We shake hands. We say good game. We wish the coaches good luck in their next game.
I would certainly prefer nothing and keeping it about softball. But that is not how it works. When it does go another direction you need to decide that given your role as a HC representing your team, your organization and the sport itself how you will respond. The choice is up to you.