No. I was raised Catholic. Altar boy, the whole bit (no sodomy though).
When they say "Body of Christ" to you, you accept it by saying "amen".
I wonder if I could fake a Muslim or Jewish service? Somehow that seems unlikely... might be fun to try though.
I never been to a Muslim service, but from what I know, it is mostly ritualized prayer.
I've been to numerous Jewish services--Reform, Conservative and Otrthodox.
Unless you are specifically required to do something (If you are a Levi or Kohen or some officer of the congregation), you don't have to do anything but sit there.
Keep in mind that Jewish temples and synagogues are owned and operated by their congregation. To be a member of a congregation you pay an annual fee. Many synagogues have assigned seats.
On most Saturdays, you will find plenty of open seats, but on High Holy days, you'll probably have to stand or something. Those seats are usually all paid for and families buy tickets for guests. In a reform synagogue you can probably sit wherever. In an Orthodox one, men and women sit in different sections.
Jewish services--particularly Orthodox are more chaotic to my eyes than any of the christian ones I ever attended. The Rabbi will be doing his thing while other men (Kohens?) will be doing some type of ritual elsewhere. Plus people are chit chatting and coming and going all the time.
An entire Saturday service is several hours long--though most of the people only come for the part surrounding the surmon.
Of course you will expected to wear a kippah and perhaps a tallit.