I do think there is a valid definition. But it doesn't stay with "E-Christians" alone but "E-Religious People". There is clearly a subset of people who IRL, barely, if at all, keep up with the Morals and Obligations of their Religion, But Online start to greatly flaunt these Morals and pretend to be the embodiment of piety. A very obvious example would be Groypers, back in 2021.
No Religious Obligations IRL, Postouring Online.
Another Example would be Millions of "Internet-Muslims". Who IRL break every Islamic Law ever but get angry as fuck if you break a law that by Islamic Rulings isn't even that big of a deal.
Pornposters who the next second talk about Christianity.
Or a personal favourite of mine, because Indian Internet is funny as fuck "Radical Hindus".
Does TRS use it differently, certainly.
But my problem with "E-Christians" boils down to "If that is your thing be as strongly and consistently for it IRL as you're online."

RT: https://nicecrew.digital/objects/78f32440-17a6-4646-a6d3-6f276640f3f0