I'm not a Christian myself (or religious at all) and I am definitely not saying that Christianity doesn't have major corruptions which are ongoing to this day, but OP is obviously using 'cult' in quite a distinct way here.
There isn't a hard and fast distinction between cults and regular religions, but there are some distinct features which help identify cults. Things like having a charismatic, living leader who claims special powers / insight / divinity; pressure to make quick decisions about belonging to the organisation; isolation from friends and family; brainwashing; and extreme difficulty or disincentives to leave the group. If a group exhibits some or all of these traits, there's a good chance it's a cult.
It's pretty obvious that mainstream Christianity - let's say the Church of England - doesn't fall under that label. Once upon a time there was a charismatic living leader, but that is no longer the case. There are a handful of men and women who are seen as leaders and teachers, but there is no cult of personality in respect of an individual. Members of the CofE are encouraged to give money, but they aren't required to, and there are no minimum spends (unlike in scientology, for example).
CofE members aren't required to cut off contact with their families, or to move to CofE designated living areas.
The CofE doesn't brainwash it's followers. In fact, in the modern age, debate and discussion about what Christian teachings mean and how they should be interpreted is a hugely important part of the Church. There are many interpretations and schools of thought that all coexist reasonable peaceably under the same umbrella.
If you want to stop going to church, the CofE won't threaten you, or contact your employer to suggest your mental health is compromised, or blackmail you, or set out to ruin your reputation.
You don't have to 'sign up' to be part of the CofE. You can attend church as much or as little as you want. You can be an involved member of the Christian community, or never attend anything at all.
I think it's very unhelpful to people actually concerned about cults to conflate cults with all religion. If you want to make a point about how you think religion is damaging or unhelpful or backward then go for it. But by claiming it's all a cult, you're really not aware of the specific distinctions that make cults so harmful for those trapped in them.