how do you behave at christian ceremonies?

Please don't think this is a double post, I have also put a similar post in the christian section as I would like their opinions... but I also want to hear what other pagans do.

On friday I went to my husband's cousin's funeral. It was a beautiful christian ceremony, the hymn that was chosen was beautiful, but very christian.

The lord's prayer was also said by the congregation.

I have every respect for their path, and even get a sense of peace in churches. I love seeing anyone getting strength and peace from their religion, but christianity just doesn't resonate with me.

I don't want to be a hypocrite by saying prayers or singing hymns that I don't believe in, but I don't want to be seen as rude by not joining in.

What do you do in these situations?