Symbol: Holy Spirit is definitely the symbol of the Holy Orders because Holy Spirit is same as God. Pope Francis is with Holy Spirit in this picture and this absolutely symbolize that the Pope is with God and blessed by God.
It is not necessary to believe in god to be a good person. in a way, the traditional notion of god is outdated. One can be spiritual but not religious. it is not necessary to go to church and give money - for many, nature can be a church.