Or people have taken a good hard look at their faith, thoroughly analyzed it, and have come out the other side with it intact.
The sheer arrogance to assume that anyone who remains faithful has simply not given their faith any deep thought is why these atheist memes exist.
Yea, no.
That person hasn't analyzed it as thoroughly as they thought they had.
I mean, to "thoroughly analyze" the religion they were indoctrinated with since birth by their parents, and then being like "Whew!!! glad to self-confirm that my religion was right all along...lucky me that I was born into the right household on this side of the world in this period of human history! And these super-questionable stories that totally don't mesh with what we observe in real life seem legit!"
...I don't think that person is a great critical thinker, no.