You could hire someone as a way to challenge your beliefs.
My best guess: people are really bad at generalising someone's aptitude in one area to another. It's a common joke in academia actually, where obviously and genuinely intelligent people failing to manage basic tasks is common.
So, assuming you are correct in estimating their aptitude towards picking a religion/lack of (I'll say nothing either way), it'll generalise poorly to their aptitude as a developer.
Then what's the problem? If all you are doing is evaluating them for technical skill, then only the resume and interview performance should matter. Personal beliefs such as religion don't enter into it.
My (mis)conception is that it implies inability to advance too deeply into a particular problem. Because if you went deeply enough into the "Jesus" problem you'd understand it's myth/story-telling.
Plus, it's one thing to be a Jesus lover. It's completely another to wear it extra-proudly on your technical website/profile.
"Jesus lover" on their twitter feed tells you little about their personal variation of Christian theology. Entirely possible they're not literal word bible believers.
My biggest suggestion to you is to have some actual conversations with a variety of Christians. I'm willing to bet you have some serious misconceptions about their beliefs.
I literally made this post to challenge my beliefs.