It may sound stupid, but I have never really questioned it... What is the religion in Greece today? Have they converted to christianity? or do they still belive in the many gods? like appollo and zeus?

Hi,
As you probably know, even the New Testament original text is in Greek. Here is a study demonstrating the www.ellopos.net/elpenor/greek-orthodox-history.asp">Greek origins of Christianity.

Here is also a discussion about neopaganism, a small part of Greeks still 'worshiping' ancient Gods.