because “I was a Catholic and he was not.”
LOL....There is much more to it than that.
Yes. While any believer can rebuke the devil in their own life (see multiple Scriptures), it is extremely dangerous for one who is not a fully mature Christian to do battle with a legion of demons attacking someone else. (Note the Biblical example of those men who tried to cast out demons in the “Name of the one whom Paul preached”. They had no authority over them, and were beaten up by the demons.) As Jesus said, after his own disciples had difficulty, “This kind comes out only by prayer and fasting”.