There are artifacts which states "Pater Noster" (Our Father) along Alpha and Omega symbols around the words. People suspect this is a reference to the beginning of the Lord's prayer. If so, that might place Christians groups in Pompeii around 40-60AD. That is, of course, too close to the original events of Christ for several secular (godless) professors to approve of, but what do you think?
Is is this really evidence of a early Christian symbol?
https://earlychurchhistory.org/christian-symbols/the-romanrotas-square/