Freemasonry, promotes a belief in God. However, upon closer examination, we find that the only belief requirement is not that one must believe in the True and Living God, but rather, that one must believe in the existence of a "Supreme Being", which can include the "gods" of Islam, Hinduism, or any other world religion.
Salvation from Sin:
Mason's View: The very process of joining the Lodge requires Christians to ignore the exclusivity of Jesus Christ as Lord and Savior. According to Freemasonry, a person will be saved and go to heaven as a result of his good works and personal self-improvement.
The View of the Bible:
Mason's View: The Bible is only one of several "Volume(s) of Sacred Law," all of which are deemed to be equally important in Freemasonry. The Bible is an important book, only as far as those members who claim to be Christians are concerned, just as the Koran is important to Muslims. The Bible is not considered to be the exclusive Word of God, nor is it considered to be God's sole revelation of himself to humankind; but only one of many religious sourcebooks. It is a good guide for morality. The Bible is used primarily as a symbol of God's will, which can also be captured in other sacred texts, like the Koran or Rig Vedas.
The Doctrine of God:
Mason's View: All members must believe in a deity. Different religions (Christianity, Judaism, Islam, etc.) acknowledge the same God, only call Him different names. Freemasonry invites people of all faiths, even if they use different names for the 'Nameless One of a hundred names,' they are yet praying to the one God and Father of all.
The Doctrine of Jesus and the Trinity:
Mason's View: There is no exclusivity in Jesus Christ or the Triune God who is the Father, Son, and Holy Spirit; therefore there is no doctrine of the deity of Jesus Christ. It is deemed to be un-Masonic to invoke the name of Jesus when praying, or mention His name in the Lodge. Suggesting that Jesus is the only way to God contradicts the principle of tolerance. The name of Jesus has been omitted from biblical verses that are used in Masonic rituals. Jesus is on the same level as other religious leaders.
Human Nature and Sin:
Mason's View: Through symbols and emblems, Masons teach that man is not sinful, just "rude and imperfect by nature". Human beings are able to improve their character and behavior in various ways, including acts of charity, moral living, and voluntary performance of civic duty. Humanity possesses the ability of moving from imperfection toward total perfection. Moral and spiritual perfection lies within men and women.
Adapted from www.gotquestions.org