Freemasonry is one of the world's oldest secular fraternal organisations. Freemasonry is an organisation of men concerned with moral and spiritual values. Its members are taught its precepts by a series of ritual dramas, which follow ancient forms, and use stonemasons' customs and tools as allegorical guides.
 
The Essential Qualification for Membership for admission into and continuing membership is a belief in a Supreme Being.  
Membership is open to men of any race or religion who can fulfil this essential qualification and who are of good repute.
 
For many years Freemasons have followed three great principles. Freemasons believe that these principles represent a way of achieving higher standards in life.
 
Brotherly Love - Every true Freemason will show tolerance and respect for the opinions of others and behave with kindness and understanding to his fellow creatures.
 
Relief - Freemasons are taught to practice charity and to care, not only for their own, but also for the community as a whole, both by charitable giving, and by voluntary efforts and works as individuals.
 
Truth - Freemasons strive for truth, requiring high moral standards and aiming to achieve them in their own lives.
 
There are two very good explanations of what Freemasonry is all about, and some steps you can take to become a Freemason.  See the booklets here and here

For more information about Freemasonry visit the UGLE website