QAnon is tied in with fundamentalist Christianity, not a replacement for it. If you go back to the 1970s fundamentalist Christians have been waging an ongoing war with imaginary (and maybe a handful of real) Satanic cults, and the bizarre conspiracy theories of QAnon directly involve the notion of Satanic cults.
This was not just in the United States. For instance:
"And the Kellers’ case was not unique. Throughout the 1980s and 1990s, hundreds if not thousands of other innocent people would fall to varying degrees of similar fates.
British Prime Minister Edward Heath was falsely accused of being a member of an underground cult that murdered and ate 16 children.
A California daycare was shut down and its staff arrested after police received false reports that children had been forced to witness ritualistic killings of animals and babies."
https://nationalpost.com/news/canada/the-canadian-book-that-tricked-the-world-into-believing-they-were-overrun-with-satanist-murder-cultsThe only thing I disagree with there is that this goes back to the 1970s (if not earlier for all that I know, and not the 1980s.) It was at the end of the 1960s that a lot of 'new age' religions sprouted up and some of them called themselves Satanists or Luciferians (witches and Wiccans were also lumped in.) Virtually all of the Satanists or Luciferians were otherwise ordinary people who generally believed that the Bible had been misinterpreted, because, history was written by the winner, God.
They believed, going back to the Garden of Eden, that God was trying to keep humans ignorant and, ultimately enslaved, and that it was Satan or Lucifer who opened the eyes of humans by having them eat the fruit of the tree of the knowledge of good and evil.
However, obviously Fundamentalist Christians could not accept this alternate interpretation of the Bible and believed these Satanists or Luciferians were literally doing the work of Satan and tried to warn the world about them. (I recently gave away several books written by fundamentalist Christians on 'the new cults' of the 1970s, including a book written by Bob Larson and a book called 'Satan Wants You.')
The Bob Larson and at least one of the other books was published in the 1970s. Satan Wants You was published in 1980. I was actually surprised it wasn't published earlier.