Well I've certainly seen the arguement on here from some Creationists along the lines of "well.. millions of people can't be wrong"
I had this exact argument with Mike, back in the day. (Lord knows what topic it was in now.) The gist of what he said* was that he had a hard time believing that all those millions of Christians were deluding themselves.
My response then, as now, is that if Christianity is right, then there are about four billion non-Christians on the planet who are deluding themselves. So no matter what, there are huge numbers of delusional people out there.
*(he's more reasonable now, but still refers to himself in the third person for some reason.)
"We had survived to turn on the History Channel
And ask our esteemed panel, Why are we alive? And here's how they replied:
You're what happens when two substances collide
And by all accounts you really should have died."
-Andrew Bird