halacha - Can a non-Jewish person participate in a bris?

My best friend is Jewish, and I have been involved in most of the most important events in his life. I was the best man at his wedding, I celebrated Hanukkah with his family, and I am the "godfather" of his son (although this last item is purely honorary, and if my friend and his now-ex-wife died, I'm sure he would be adopted by one or the other set of grandparents).

I was asked if I wanted to attend the bris, and even to participate in the ceremony, but I just couldn't bring myself to do it - I'm not especially squeamish, but I think seeing the circumcision taking place would have been too much for me to handle. I politely excused myself from the event.

I'm not sure if it is generally accepted for a non-Jewish person to take part in a bris. My friend is almost totally non-observant (not only does he cover himself in tattoos and eat whatever he wants regardless of kosher laws, he even celebrates Xmas), so I am wondering if his invitation was possible only because he doesn't care about the accepted practice among observant Jews.

Is it acceptable for a non-Jewish person to participate in a bris?

Answer

See this article regarding the ceremony itself. Near the beginning of the article, it states that non-Jews may attend a brit. As a matter of fact, I invited the CEO of my company, a non-Jew to my 1st son's brit. (It was well-worth the gift that he gave, afterwards, but that wasn't my incentive ;-)

As for participating, IIRC, my rav mentioned that there is no problem with a non-Jew being the Kvater - the one who presents the baby coming into the room. (See details on the ceremony). Sometimes this is given to the grandparents, and there have been many cases where the grandparents are not Jewish, but the parents are. The rav could not find any problem with this honor.

I'm not sure if the sandek must be Jewish. Refer to this reference (I'll try to edit in relevant parts from it, later.) Then, again, being a sandek would bring you about as close to the baby as the mohel, and if your squeamish, you're definitely not going to want to be a sandek.