Satan has a church of his own on earth and anyone who does not have scales on their eyes could see it. I would guess at random that Lucifer's church would specialize in infant buggery and publishing satanic doctrine and theology.
They dress in black so you will know they are the bad guys. The good guys also do not wear cones on their head and carry magic staffs.
You know them by their fruits. Forbidding to marry and claiming that men can accept confession and bestow grace. Compare with scripture and you be the judge.