If you're not christian or really religious, is it offensive to wear a necklace w/ a cross?

I have this necklace from my plague doctor costume and for some reason I just really like wearing/looking at crosses, right now im not christian and i believe in greek mythology more even though i havent went into religion that much though i might at a later date, and i want to wear the cross because i really like how it looks but i dont want to be offensive and i dont know if it IS offensive, if you're christian/have good knowledge on the religion could any of you tell me if it is?