Yes, AJ is a very Christian person. He's said so himself in interviews that his relationship with God is incredibly strong, even going so far as to say it's "God first, Family second".
That being said, he's also one of the most respected and well-liked wrestlers in the industry today.
Also to add, one of his good friends in the business is rumored to be gay. So don't go "homophobic" just yet with him. Not to mention, dude was a gymnast while being an amature wrestler in college, take that for what it's worth.