The app I use (“Boost”) made it extremely easy, it’s pretty much just as easy to use as reddit or instagram I would say - maybe even easier.

I think that they are referring to the somewhat adversarial attitude of the comments in this thread. I think that a religious person, especially a self identifying Christian, would feel a bit uncomfortable reading these comments.

Merriam-Webster on “militant” (2nd definition): aggressively active (as in a cause) : combative; militant conservationists; a militant attitude