No one has still answered my question: Why should we worship a God that would punish someone eternally? It's unjust.
God has eternal laws that he lives by and expects us to live by them as well. When we break these laws (by sinning), there is a punishment affixed (just as there is a punishment in committing a crime). God, living and keeping the law perfectly, must justly punish a sinner for breaking the law, else he would cease to be God since he would have broken the very laws he must follow. If we refuse to repent and take part in the atonement of Jesus Christ, we are at fault and must take the punishment that is affixed to the sin we have committed. So, in other words, it is justice in God to punish someone "eternally." We may not think this just, but God cannot go back on his word, and all he asks us to do is repent.
I'm pretty sure "eternal" is a duration, too.
@Fwop & Anonymous - I believe it refers to the duration. As in all eternity. Then again it is also the punishment that God made so "God's punishment" would work too.
I can't really agree with "eternal" referring specifically to the duration. I won't keep arguing this since I doubt you will things my sources are credible, but I believe them:
"Nevertheless, it is not written that there shall be no end to this torment, but it is written
endless torment. Again, it is written
eternal damnation; wherefore it is more express than other scriptures, that it might work upon the hearts of the children of men, altogether for my name's glory. ... For, behold, the mystery of godliness, how great is it! For, behold, I am endless, and the punishment which is given from my hand is endless punishment, for Endless is my name. Wherefore-- Eternal punishment is God's punishment. Endless punishment is God's punishment." (D&C 19 6-7, 10-12)
"These are they who are cast down to hell and suffer the wrath of Almighty God, until the fulness of times, when Christ shall have subdued all enemies under his feet, and shall have perfected his work;" (D&C 76:106)
"And after they have paid the penalty of their transgressions, and are washed clean, shall receive a reward according to their works, for they are heirs to salvation." (D&C 138:59)
None.