As one who was raised Evangelical Christian for the majority of my childhood by a devout and Republican parent, I’m pretty sure it’s just a death cult.
They live their whole lives only preparing to die.
They forsake and forego a lot of random stuff in favor of rewards after death.
And if they think it’ll get them any bonus, they don’t care if they take everyone else with them, hence the Republican Evangelical politicians generally trying to supply the ingredients for the battle of Armageddon to happen.
Tldr; I think it’s greed typical of those who would fully knowledgeably choose to be a Republican combined with the beliefs of an Evangelical trying to cash in on rewards asap, in the way a Republican typically does.