It's much simpler than that. You are a part of something that's bigger than yourself. Whether it's a team, a congregation or a community. The advantage that religions have is that they are to a certain extent aspirational in that you have a set of goals you want to live by. I think that makes it easier to deal with immediate or short-term adverse conditions because there is a long-term objective. However this is not restricted to religions, warrior codes appear to be remarkably effective in dealing with extreme adversity.

don't underestimate the soothing/empowering effects of rituals, rotes and congregations.

even without a deep belief, the routine itself can keep you going: this can be compared to accounts from prisoner camp survivors; it's often mentioned 'falling into the routine' as part of holding up and moving forward.