It is a fraternal society based on certain moral and religious doctrines; the moral doctrines including Brotherly Love, Relief and Truth, Temperance, Fortitude, Prudence and Justice, and the religious doctrines comprising a belief in a Supreme Being and the immortality of the soul.
Freemasonry might also be defined as a charitable, benevolent, educational, religious society with a purpose to teach by ritual and symbolism the building of good character.
It is charitable in that its income is not expended for private gain, but is devoted to the improvement and promotion of happiness and the well being of mankind.
It is benevolent in that it teaches unselfish concern for the welfare of others as a duty, and exemplifies it by the relief of poor and distressed brothers and their needy widows and orphans. Masonry is not an insurance or benefit society.
It is educational in that it teaches by prescribed ceremonials a system of morality and brotherhood based on Sacred Law. It emphasizes the duty of man to be curious about the world; to develop his intellect and skill; to be just; to follow precepts of conscience and exercise self-control; to be earnest and sincere. Freemasonry’s Lodges, Temples and Libraries are aids to this end.
It is religious in that it teaches belief in one God, a belief prerequisite for membership, though without dogma or creed, for Freemasonry is not concerned with creeds or theology. Every Lodge must have an altar and on it, when the Lodge is in session, a volume of the Sacred Law.
Freemasonry is social in that it fosters the natural friendliness and a true spirit of brotherly love and affection that should take place in the lives of men associated and united for noble purposes.
While a belief in a Supreme Being is the primary mandatory requisite to membership, Masonry does not require membership in any church as a condition of membership.
Conversely, membership in a church is no restriction to admission to Masonry. There is nothing in our requirements to prevent a Roman Catholic, a Mohammedan, a Buddhist, a Latter Day Saint (Mormon), a Protestant or a member of any religious sect having a belief in one Supreme Being from becoming a Mason, and we have within our membership adherents to each of these religious groups. Discussion of sectarian religion is prohibited in the Lodge in order to maintain peace and harmony, but Masonry encourages its members to take an active part in the churches of their choice.
Source: GLP Website