Is Freemasonry a religion?

No, Freemasonry is not a religion. Freemasonry strongly encourages its members to belong to an established religion, although that is not a requirement for membership (only that a candidate profess a belief in a Supreme Being). Masonry is a fraternal organization that encourages morality and charity and studies philosophy. It has no clergy, no sacraments, and does not promise salvation to its members.