Consider:
You can see that almost every big religion tell that a time of great tribulation will come.
Shouldn't it be the following?
You can see that almost every big religion tells that a time of great tribulation will come.
Context and new context. (Related: Is none of singular? and Is everything singular?)
donald remero
[ Moderator ]
Yes. Every [one] is always singular, even when the [one] is many.
Perhaps the original author mentally read it with “all” for “every”, as in “You can see that almost all big religions tell…”
robertd
[ Editor ]
I agree with your rewriting; the first would work with "all" instead of "every", as in:
You can see that almost all big religions tell...