That said, I do feel like there is a movement towards Christianity being less accepted, or popular, in our society than it used to be. This is my own perception of course.
Christianity is on the decline in the U.S. It is still disproportionally high, however. You should expect a bumpy ride down since the U.S. is @75% Christian and Europe is something like @13% (depending on types, yadda). It is expected as America matures that fundamentalism in particular will subside to European levels.
It is still growing I believe in Africa and I think China of all places, last I looked. I think the Chinese Christian rise is tied to the "Christian materialism" movement in the U.S. which comes to countries of wealth. It is just cherry picking the bible of course; another branch that chooses to ignore certain bible teachings over others.