Every denomination, mainline or fringe, qualifies or compromises the divinity of Christ in some way. Either by adding him to a trinity, by making him subservient to the Father, or by adding a human nature to his divine nature. Is Christianity now completely apostate?
Not all religions make exclusive truth claims. Religions of the Judaeo-Christian tradition do so, as do Zoroastrians. Niether Hindus nor Buddhists make such claims but usually believe in some form of inclusivism. Neopagan and Reconstructionist religions are generally pluralistic.
Not all Christians believe that they're right and everyone else is wrong, only Christian Exclusivists believe it, Inclusivists, Pluralists & Relativists hold different views regarding truth-claims. Exclusivists of all religions believe that their religion is right and everyone else is wrong.
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If Christianity is not a religion but a relationship with Jesus as many ministers and Christians say. Then why do they keep posting on the Religion Message board? Surely they should be posting over on the relationships boards?