I was a member of the Catholic Church in Germany, a "visitor" at the Lutheran Church (Evangelische Kirche in Deutschland, EKD) in Germany (which are both official churches, so they're almost but not quite "state churches") and a "visitor" in a Protestant group affiliated with NCMI (
New Covenant Ministries International - Wikipedia). While abuse is a general phenomenon which may occur everywhere (child abuse), I think in the official churches the possibility of abuse is probably lower because of their established structure. From what I learned, the Lutheran Church members are not as much interested in hierarchy as the Catholics and give more importance to a culture of discussion.
The only church I can say something negative about is NCMI. The community I was a guest/prospective convert in were deceptive about the true extent of involvement they expected from you. It started out as a one hour service mostly with "praise music". Then there was a two hour Bible-based service before the "praise" service they didn't call Bible class but "strength training". Maybe I was a bit naive but I thought they'd really lift weights on Sunday morning
. Then I was given a timetable with group activities for every day of the week, like at school. They also made huge efforts to connect you to the group, for example by regularly inviting you for dinner every week with church activities afterwards. Another thing (which I cannnot prove) is that they likely gossiped and talked to others behind your back to find out what your personal weaknesses were in order to "offer Jesus as the solution" for those personal problems. They also made general efforts to make you spend all your time in the group. For example, at a weekend when there was an autumn/Halloween related fair (which in itself was just fun and not at all religious), they had a cooking event to prevent their members from mixing with the "ungodly". They also had a "tutor system" with a rule that in personal conversation, a "tutor" may only "counsel" / preach to a prospective convert of the same sex. I could go on and on with the oddities but I'd say was definitely a form of abuse of power. The problem is that for smaller (especially Christian) groups, you often cannot get any information about what they're like, in stark difference to non-Christian groups who, in Christian cultures, are often seen as "evil" and therefore seem to invite criticism. As for the NCMI group I was in, most NCMI member groups seem to call themselves just "Jesus communities" in Germany , without openly referring to NCMI, and as Jesus is seen as the epitome of "good", something that has Jesus' name in it can't be bad, can it?