anta min ayyi Taa'ifah?
That's standard for "What denomination are you?" More likely to be said "anta min ayyi kaniisah?" "What church are you from?"
My guess is that he would be interested in just seeing fellow Lebanese, especially fellow Christians of whatever stripe.
yes. I must admit, I'm a very ignorant American!
That you are asking this shows you cant' be that ignorant.
I was astounded that he hasn't heard of Halloween. If he is indeed an Orthodox or Eastern Catholic, that will be fine. I just don't want to be taking a Baptist to an Orthodox service, unaware of how different it is!
For some Protestant Lebanese, that may be a problem. Most, however, being such a minority in Lebanon and the Middle East in general, are used to us.