I believe it is, if we use the word Christian as an adjective, and not as a noun.
It is possible to adhere to the enlightened moral teachings of Christ (and in this sense describe oneself as one with Christian qualities), be respectful of the name and spiritual stature of Christ, and celebrate the meaningful dimensions of Christian tradition, and still be an atheist.
Likewise, I believe that one can be Hindu in one’s religious outlook by being respectful of all (non-hurting) religious faiths, by partaking in the meaningful festivities of the tradition, and by being reverential to the beautiful icons and inspiring symbols of the religion, and still be an atheist.
I am inclined to think that there are countless atheist Christians , Jews, and Hindus.
However, while individuals may be this way, religious institutions and guardians of orthodoxy will not look upon this favorably.
If they had the power they would ex-communicate and/or ostracize such individuals, and call them names.
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March 11, 2012