"Christianity has taken over American culture."

Not sure where you get your stats...

"According to an average of all 2023 Gallup polling, about three in four Americans said they identify with a specific religious faith. By far the largest proportion, 68%, identify with a Christian religion, including 33% who are Protestant, 22% Catholic and 13% who identify with another Christian religion or simply as a "Christian." - https://news.gallup.com/poll/358364/religious-americans.aspx

" A new PRRI survey finds that 10% of Americans are avowed Christian nationalists and an additional 19% are sympathetic to its ideals." - https://religionnews.com/2023/02/08/a-third-of-americans-are-christian-nationalists-and-most-are-white-evangelicals/

Doesn't look like much of a takeover to me. It isn't sound logic to lump divergent cultural groups into one basket and then to criticize a whole designated basketed group because of a few bad apples. There's plenty of "rotten apples spoiling the whole barrel." For example, put all Americans in one big basket and ask for the Europeans perspective...