The real question is how many tepid and passive individuals who called themselves Christians have finally thrown in the towel and given up on the pretense?
It’s the argument of quantity vs. quality. People who are Christians In Name Only do not help churches, but just drag them down in a relativistic mire.
Not a single church that has been doctrinally taken over by liberals has found a deeper expression of faith by doing so, except when the faithful have had enough and schism to found a new, real church.
In turn, the liberal churches become hollow shells, devoid of life, no longer forgiving sin but instead just justifying it. As such, they begin the long decline into irrelevance.
That's what I've been saying for a long time. This absurd figure of "2 billion Christians" that gets constantly repeated is a crock. I'd be surprised if there were actually 500 million practicing, believing Christians in the world.
The church attendance figures for the US are also heavily suspect. Some argue that actual attendance is about half of that claimed by people being polled.