There is another, opposite factor.
As more and more "churches" adopt secular values based on letting their members "vote" on what is true - they cease to become organizations worthy of membership.
So many people choose to study Biblical Christianity on their own or in small groups - as it was originally organized.
So we should be asking - are those leaving rejecting Christ or all the irrelevant trappings that have been layered on to the Good News?
I think, IMHO they are walking away from limited thinking. The creator is so much more than the ideology of religion.
True. But it throws out the baby (God's revealed truth) with the bathwater (how religions have tainted that truth).
Nevertheless, a great "falling away" was predicted by Paul just before Jesus returns. Looks like we are on the leading edge of it.