Is this normal for a 3 year old?

Your son might be the victim of ual abuse (of course I don't mean you - but what about the church group or is he with others while you're not around?). It's definitely something to look into since such abuse DOES happen. Not trying to scare you, but it's better to be safe than sorry. Seems like he's trying to let out a lot of anger - so there must be a reason why. A lot of times ual or physical abuse is the cause. Take him to a therapist & see if they can help. Good luck.