My stepson has gone from agnostic to committed evangelical Christian, praise God. And so I necessarily have much less to dispute with him. His perspective is that his church is a "Pauline one with fellowship and accountability", in other words, by including some cult-like features such as the time-honored precepts of peer pressure, constant comparisons to another's "walk", shunning in extreme cases and constant gatherings to read the Word, he feels he is much more likely to make progress in the spiritual life. And I can't really disagree with him there. Most of us are to some extent or another lazy, and that accountability factor may be necessary. Now I could answer that the RCC has accountability - it's called Confession. Kathy the Carmelite, by the way, was brilliant in anticipating, almost in a psychic sort of way, what his position would be.
I'm not sure how convincing Confession as accountability would be to him - certainly it wasn't convincing to a fellow Protestant friend who said that when he was growing up in the 60s the Catlickers were seen as going to Confession and promptly sinning egregiously immediately. In his eyes, Confession seemed to have no impact. Such is the power of example - our behavior is the acid test of faith.
I guess I could say if you really want fellowship, community and accountability, there's always a monastery! (Just stay away from the hermitage).
UPDATE: See Kathy's response.