From the Grand Lodge of Tennessee's official webpage:
The mission of Freemasonry is to promote a way of life that binds like minded men in a worldwide brotherhood that transcends all religious, ethnic, cultural, social and educational differences; by teaching the great principles of Brotherly Love, Relief, and Truth: and, by the outward expression of these, through its fellowship, its compassion and its concern, to find ways in which to serve God, family, country, neighbors and self."
Also found on the Grand Lodge of Tennessee's website under "History":
It is strange, and yet a commentary on human nature, that Masonry has been accused by some detractors as being atheistic; at the same time, others accuse it of being a religion. The first charge evolves from the fact that Masonry teaches religious liberty, will not give preference to any specific religious denomination, and refuses to interfere with a Mason's religious duties. The second charge, that of being a religion, is equally ridiculous. It is true, however, that we often call our buildings "Temples" or "Masonic Temples." It is true that all regular Lodges have altars upon which the Holy Bible is displayed. In countries where the members are not Christians or Jews, the appropriate "Book of the Law" is displayed. It is also a fact that Masonic meetings are always opened and closed with prayer. However, Masonry is not a religion, and any member who states otherwise is mistaken. The presence of the Bible in the courtroom or the offering of prayer at any public gathering does not make churches of those places. There is only one religious test for a man to become a Mason: he must believe in a Supreme Being.