I did see the first one (and so did my son - we rented it), but have not seen the second one yet. I did not find the first one all that freightening, in fact my son described the second one as "dumb" and not worth wasting money on.
I would not permit my son to see a Rated R movie, but since this was PG-13 (and his is 13) I thought it would be fine. When I was a dub I used to believe that watching movies about demons was "inviting" them into your house, but I don't believe that crap these days.
The only time my son goes to the movies with his school friends is when he is with me, and it honestly is not that often (a few times year). He knows going with his "wordly" friends is a treat.