Speaking as a very religious person in a very irreverent Air Force, I know there is a time and place for religion. My own beliefs about God and mankind are what justify, to me, bringing a world of hurt on bad people on the ground. However, that is MY belief, and while I would love to share it with people, I only do it when they ASK, not at a mandatory briefing. My 2 Cents.
On the other topic about letting people know you are religious, I may not be the best TDY partyer there is, but my buddy on a TDY in Thailand was very grateful I wasn't drunk--did a strategic save to keep him from the clutches of a Ladyboy.