Let's turn that question around. When my Jewish friend asked me to serve in his wedding, he asked me up front if I would have a problem with wearing a yarmulke during the service. There would certainly be prayers said to the God of Abraham, Isaac, and Jacob, asking for His blessing on this marriage. Should I wear the covering to avoid causing offense?
(The answer is that it took me about 750 milliseconds to agree to wear the kippah. It was an honor to stand with my friend, though it turned out I was not required to wear a yarmulke after all. And the God of Abraham, Isaac, and Jacob has indeed blessed their marriage; thirty-three years and a daughter and two sons later, they're still happily married.)