It's not so much that he's religious, it's that he hates everyone who's not religious and has become the religious version of an SJW, plus he lies pretty much non-stop about basically everything.
Dumb fuck even tried to say that using his real name, which he proudly put out there when he started his EscapingAtheism/RedPillReligion bullshit, is doxing.
You should see some of the people who he pals around with. Like this Eve Keneinan bint on twitter who likes to pretend she's a professor and philosopher but is most likely either Dean himself or his ex-wife (or possibly her sister, Eva.)
She decided to try and call all atheists SJWs while unironically coopting SJW terminology like "Mansplaining" and turned it into "Atheistplaining".