[King Prout]

you make the assumption that your interpretation of Christianity is the one true version.
those I noted from history made the same claim, with the same level of evidentiary support.
this renders your dismissal of them as false Christians a matter of he-said-she-said. in matters religious, such are best labelled "no true scotsman" arguments.

[Doctor Stochastic]

Then I stripped them, scalp from skull, and my hunting-dogs fed full,
And their teeth I threaded neatly on a thong;
And I wiped my mouth and said, "It is well that they are dead,
For I know my work is right and theirs was wrong."

But my Totem saw the shame; from his ridgepole-shrine he came,
And he told me in a vision of the night: -
"There are nine and sixty ways of constructing tribal lays,
"And every single one of them is right!"

Do you like Kipling? I dunno, I never kipled