Wasn't she Christian? I thought she famously demanded to be excommunicated from the church and was at one point ordained as a priest.

Either way though kinda unfair to call something as broad a Islam a cult. There are quite famously thousands of different sects of Islamic belief and philosophy and they disagree quite a lot with each other. Islam, like Christianity, has become an amorphous belief system that can really be whatever you want it to be so long as you live somewhere religion isn't forced upon you. There are many Muslims who would definitely not support child marriage for instance, and there are also plenty who (obviously wrongly) would support it. But its not really fair to treat both groups of people as though they are one. You don't really know how any individual Muslim or Christian may think or feel about anything purely based on their self-identifiying as muslim or christian.

I'm opposed to the existence of any hierarchy, including of course religious hierarchy and the existence of clergy as a class of people with authority. But I don't think anyone is wrong purely for being religious at all. I wouldn't describe someone believing in God or Allah as being in a cult.