The answers here make me sad. There is nothing more Christian than Freemasonry. Some of the most devout Christians I have ever met are Freemasons. Don't believe the conspiracy material that is being slung around out there. Heck, all the principles of Freemasonry are based on the Holy Bible-- it's the most important element of Freemasonry because it is the word of God. There is no devil worship, there is no embracing of darkness or Satan. Freemasons embrace the pursuit of getting closer to God, to light.
If you don't believe me, seek out your local lodge and talk to some of the members there. There's also a website where you can ask whatever you want and get honest answers. There's nothing to hide. And if you're worried about the "secrets" of Masonry, I can assure you they aren't evil. They're knowledge, wisdom, illumination in regards to the human condition. They're kept secret because it simulates the experience of earning knowledge (like maturity-- you can't know it until you're there.)
But don't take it from me. Ask a Mason: http://askafreemason.org/