I have this argument with Muslims a lot, but it applies to Jews and Christians.
God is merciful, I agree, and compassionate as well. I'd like to think I'm compassionate and merciful as well, to all beings, but infinitely less so than God.
God is perfect in everything.
Now, me as imperfect being cannot imagine endorsing my worst enemy being burned and tortured to death for all eternity. Muhammad, for example, was a vile man who did many vile things in his lifetime, from pillaging to murder to rape and paedophilia to extermination of entire tribes. He left behind an ideology and his sunnah (practice) which has been emulated and as a result millions have suffered and are suffering.
Taking all this into account I would not wish to know that God has thrown this man for an ETERNAL punishment forever and ever and ever and I sincerely hope that he hasn't. This, even if he has done all those things, is an excessive punishment unfitting of a deity who is merciful, kind and all good.
Those who have done evil to other humans should repay their evil to other humans whom they have caused pain. It would make sense for God to, instead of throwing them into Hell, take them back to Earth as our lives are our suffering. Re-living again will make the spirit mature, grow in wisdom and enlightenment, and perhaps after thousand of lifetimes be fitting to be with God.
85 years is too short of a period of time to merit an eternal punishment.
Something is wrong somewhere with your interpretation of God. I'm not saying you're ''wrong'', I just feel it's offensive to an idea of a deity you're propagating.