Actually, the official definition of Christian is one who follows the teachings of Christ; hence, the "Christ" in [i]Christ[/i]ian. The differently entitled religions are differently entitled for a reason; hence, they're not truly Christian.
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You can call yourself whatever you want but if you actually follow Christ then you would follow the old testament(and obviously the new).Jesus didnt just say "do what you want and you know follow the old testament if you feel like it".He taught us to follow the old testament.