I do think that there are a lot of good branches of Christianity out there, where the main focus is on loving thy neighbor and opening the way to God to all people, not being exclusionary.

My experience of religion, like so many others though, hinged (more and more strongly over the years) on a literal interpretation of Genesis. One in which eating a bad piece of fruit causes inseparable rifts between parent and child; one in which the creator of all, the knower of all, created rules that unless I grovel and beg and pledge constant devotion, I deserved eternal conscious torment for existing. That's an abusive belief. Especially to teach children.

That's before the curse of Eve, for eating the bad fruit first, causing the pain of childbirth, hereditarily (the biggest cause of death in women throughout history), as well as god-sanctioned subjugation of women. (For example, a woman doing everything right knows not to try to teach a high school group--those are men that she's not qualified to minister to. She knows it's better not to vote in church matters, even if she's allowed, because the head of household, her husband does that). This creates social structures that disempower women as a point of culture, another abusive trait.

Children also deserve subjection. They are to be obedient at all times, it's literally one of the commandments. Our denomination taught that "Obey thy father and thy mother" also applied to all earthly authority over us. Authority and structure mattered more as a culture than understanding and insight.

And the social culture of church can feel toxic or stifling. Often outright sinning, even as a repetitive behavior is tolerated in church spaces (especially in cases of child or domestic abuse), but someone who has reason to think a little differently (like believing in Jesus without believing in Genesis, being queer, being progressive) is shunned or made to be quiet. They know from a young age that their voices can never be respected in those spaces, the number of sermons I heard about how evil/misguided/ other awful stereotype that non believers were supposed to be... It teaches othering, it teaches people to reduce other people to stereotypes of what the pastor says instead of what the person's lived experience is.

This isn't unusual for Christianity, especially in the States. My experience with abuse patterns in Christianity may truly not apply to you. But I think they apply to many.

And I'm not even going to touch on the abuse that happens to homeschooled children, often strongly correlated with religion.