Over on Earth-2, the bad Superman - brainwashed or possessed into believing he's the herald of Darkseid - orders his Parademons to destroy all the houses of worship to reinforce his belief that the only god is Darkseid.
I've condensed the captions from the first few panels on to the top of one that made me raise an eyebrow:
Scientology is one of the "fictions they have invented"?
I don't disagree but I'm surprised, knowing how litigious Scientologists can be, that DC let this through. Maybe their defence will be that on Earth-2, it's acknowledged as fiction?