Timothy McVeigh...Christian? Seriously? I’ve never seen a conservative make that claim.
McVeigh was an agnostic who said that science was his religion.
You do have a point. Some sources state he was Christian, and others say he wasn’t.
In the end some would just chalk it off and say that McVeigh wasn’t going by what the scriptures teach (and he didn’t did not go by them as we can all see) and thus he wouldn’t be a True Christian.
But saying he was No True Christian would be using the No True Scotsman fallacy.