It is interesting that the only clear reference to eternal torment in the entire Bible is found in Revelation, in a passage that is highly figurative, and in a verse which does not mention a single human person. Essentially then, the argument for eternal conscious punishment of unregenerate human beings, is an argument from silence. If literal perpetual torment was the punishment for human sin, I would expect to find numerous explicit and unambiguous references to it, such as;
And the wages of sin is eternal suffering in hell. Day and night for all eternity, the wicked will call out for mercy, but there will be none to save. Their immortal souls will writhe in endless pain. Their anger will never dissipate. They will weep and howl in the fires of eternity, aware of their loss, their endless future, with no one or nothing to comfort them. Jehosaphat 3:16
And I would expect to find such clear and unmistakable teachings in the Old Testament, in and outside hell. I would also expect to find them in the plain teachings of the New Testament; in the 'matter of fact' gospel sayings of Jesus, in the early gospel proclamations documented in the book of Acts, and finally, in at least some of the Pauline Epistles. I would not expect to have to base my position totally on ambiguous and enigmatic imagery from New Testament parables and other highly symbolic literary forms that require intensive interpretive analysis.