Something that barely gets covered is how severe, violent, touching vs full penetration etc occurred.
I am very sure that most of the worst cases in what physically was done, were Protestant by a large margin. I base this on legitimate reasoning from both how Prots approach lust vs Caths and how bad on average Prot nations have rape cases vs Cath. I am also sure Orthos have had very severe cases given how much human trafficking and abuse has gone on in their nations for centuries.
I have very little doubt that on top of that, Cath Clergy as it is so rigorously organised, has clamped down entirely on such cases. In contrast, since Prots are barely organised they cannot clamp down on Prot sexual abuse properly because they don't have enough systematic apparatus to rigorously check on all of their clergy the same way.