Jeremy, remember the difference between morals and ethics? You've just argued for ethics, but you haven't understood that morality is precisely a matter of objectively right or wrong actions. So if religions contradict each other concerning moral absolutes, then one or other of them is wrong. In the Western tradition this is why the magesterium of the Roman Catholic Church proclaims itself the teacher of absolute truth concerning moral doctrine. There is no room then for ecumenism on moral matters because it's a matter of absolute truth. The magesterium also concurs with St Thomas Aquinas's dictum: reason does not contradict the divine command; hence there is no room for a double-truth universe of reason and faith. Truth is one, and morality, as a function of truth, is universal and objective.

Knowledge of the truth is another matter, however, and so we're back to our little epistemological debate once more; but it is salutary to bear in mind, nevertheless, the difference between ethics and morality.

Eric: Genuine opinions cannot be wrong.

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That is nonsense. Just because your opinion is 'genuine', i.e., not a lie, I presume, that does not entitle you to be right.

You have an opinion, I have an opinion; they contradict each other, so they cannot both be true. One of them is false, one true.

If the opinions are contraries, however, then both cannot be true, but one or both can be false.

Either way, opinions, whether contradictory or contrary, cannot all be right except that they break the basic principles of logic, and all debate descends into nonsense.