The proper and correct use of votes is to evaluate a question or answer's usefulness and clarity, and that is the way that people should be using their votes. That said, users can use their votes however they wish, so long as they are not committing voter fraud.
This particular user has repeatedly rolled back edits made to his posts, some of them being moderator edits. He has left comments claiming that it is his right to post whatever supplementary text he wants on his answers, and that we are persecuting him for his religious beliefs. He has also misused moderator flags making these claims, and in general has wasted everyone's time.
Let's clear up a few things, shall we?
First of all, Stack Exchange is not a free-speech platform. Anyone who makes this claim does not understand what "free speech" means. Freedom of speech is the political right to communicate one's opinions and ideas using one's body and property to anyone who is willing to receive them. It does not mean that you have the right to voice your opinions using tools and platforms that do not belong to you. Stack Exchange is a privately-owned company; ultimately, they (and the user community) gets to decide what material gets posted to their websites, and what material gets removed.
Second, Stack Exchange has no obligation whatsoever to preserve anyone's supposed "right" to exercise their religious beliefs on any Stack Exchange site, in whatever form those religious exercises might take. Naturally, some sites welcome these practices; if you want to praise Jesus overtly using your own words, you're almost certainly welcome to do that on the Christianity site (but check with them first), provided that you're also providing value in the form of actually answering or asking a question.
If you want to praise Jesus on Stack Overflow, the way you do that is in your profile, by contributing high-quality content on Stack Overflow, and in general interacting with others on the site in a way that honors his name, not by the use of slogans, but by treating others with humility and respect. When Jesus said "Go and make disciples of all nations," I'm pretty sure that this user's behavior is not what he meant.