Thiel is not a Christian?
He is someone who plugged his fingers into the power outlett that is the final mile of the enlightenment. Those guys all have that same shellshocked face and the same mission: to get humanity stable, progress is every step towards a sort of global "home for the handicapped and prone to selfdestruct" everything else is just soothing sounds.
Christianity is supported because it has shown itself to be the only culture capable to produce working institutions and a rule of law. He is all for that, as the alternative is basically permawar with nukes.
Every step taken, every plan, every endavour is part of a scenario tree with fallbacks towards that goal. Selfsurveilance, a hardened education system (ai), if you start to look at the world from that angle a ton of what they do, starts to make way more sense. Also from that point of view, money itself constantly looses value, as the scenario falls down the three. Its capabilities increasing the odds that are valuable. The last billionaire gets a potato for all of it.
His anti-christ is the loop deformation damage of humanity, a species stuck in a low tech environment, unable to ever regain complexity even if history throws it a mounttain of ressources. Look at he middle east for understanding.
Thiel is a heretic.
But he is a wanker. Does that help?
He is going around talking about biblical prophecies and the antichrist so regardless of whether you consider thiel a Christian or whether he considers himself a Christian the comment you are responding to is entirely accurate in saying he is interested "only in the hate and doom parts of [Christianity]".