What took place at Delphi? What does this indicate about religion in the Classical Era?

The correct answer to this open question is the following.

We are talking about ancient Greece times. What took place at Delphi was that many people from Greece and other distant lands visited the Temple of Apollo to consult the Oracle that was there. There was a priestess whose name was Pythia, who was the woman who could communicate with the Oracle to make predictions.

This place was a mystical sanctuary for most people who attended the temple just to consult with the priestess about future events. So one could see people of all kinds, making lines to have a space with the Pythia. What does this indicate about religion in the Classical Era was that mysticism dominated this time, where people had their religious principles but were inclined to these superstitious beliefs in order to anticipate future events.

must repent and believe in god.

or the book

journey across time - chapter 10 "the rise of christianity"