Why is it offensive to acknowledge that religions are cults?

There is no discernable difference between a religion and a cult other than cults typically live together or keep knowledge within their group instead of spreading it, but there are many cults who don't adhere to this. And cults are labeled as extremist even though many cult practices have been historically just as extreme as those of major religions.

The more I learn about the history of Christianity, the more obvious it becomes that it's just a cult that grew so large people accept it as a normal lifestyle. And it's so disheartening that the rules of the cult are systemically applied to so many aspects of life in the US even if you're not Christian.

I realized the only reason things like non-nuclear households, sex, exploring your identity, etc. are frowned upon in the US is because of Christianity. I can't think of a single other reason. Some guy or group of guys said these things are wrong for their own benefit, and millions of people just go along with it....and we implement it into our fucking laws?!?!?

Cults arent inherently bad, I just can't fathom how Christians can't see that they're part of one.