I guess the OP has never watched Neil deGrasse Tyson speak about...well anything! That man has more joy about life than anyone I've ever seen.
But there probably is some truth that Christians are often happier (I know OP wants to claim joy, but studies show happiness) than those who are irreligious. It's a lot like being 3 again. Knowing someone smarter and more grown up than you will take care of everything in the end, that you are safe, and that "someone" loves you, even in your darkest hour could be a comforting belief. Doesn't make it a true belief though.
But there probably is some truth that Christians are often happier (I know OP wants to claim joy, but studies show happiness) than those who are irreligious. It's a lot like being 3 again. Knowing someone smarter and more grown up than you will take care of everything in the end, that you are safe, and that "someone" loves you, even in your darkest hour could be a comforting belief. Doesn't make it a true belief though.
“Eternity is a terrible thought. I mean, where's it going to end?”
― Tom Stoppard, Rosencrantz and Guildenstern Are Dead
― Tom Stoppard, Rosencrantz and Guildenstern Are Dead