I think I can shed a bit more light here.
My husband and I own a Masonic Lodge (well, a FORMER Masonic Lodge). The lodge building itself was owned by the Masonic Association, but they gave us the building when they could no longer financially sustain it. In the building they have their temple on the second floor -- it has elements of Greek and Roman temples (columns, thrones, etc.) -- but there is a lot of symbolism built into the temple -- certain proportions, measurements, etc. Their rituals are held in their temple space, but they also have an anteroom in which they hold dinners and other social events. Prior to us purchasing the building, the Masons rented out parts of the building - like the first floor was a bank and an insurance agency for a long time. The basement was also used for gatherings, but they rented that space out as well for dinners, receptions, meetings, etc. So, to clarify -- the entire building is called the Lodge, but the space the Masons use for their rituals is called the temple.
Now that we own the building, we have put a coffee shop on the first floor and run our online business in the building as well. We also live in the back of the first floor (it's a BIG building!). The Masons continue to use their temple space and anteroom, but there is another room on the second floor that is being used by AA, the Boy Scouts and other organizations. The basement has REALLY undergone a lot of change. About 1/3 of it is now a Redemption Center, another 1/3 is being used by our business and the final 1/3 is currently being remodeled into a laundry mat.
Now, as to what the Masons believe, I can't really comment on that -- they do, indeed, keep a lot of things secret. I do know that they require all members to believe in a "diety." There is also some OT Scripture in their temple space, so I'm guessing it's based on Judeo-Christian values. I also know they strive for personal betterment and they do some public service philanthropy.
Here is a pic of our building.