Idea of eternal damnation is an impossibility within Hinduism.
There is a hell, Naraka, for sure..and the hindu versions of boiling oil and other assorted cruelties remain. But the idea that an act, however heinous, once done condemns forever is not possible.
Allow me to explain. Every Asura, Rakshasa and other principalities of the nether world are all incarnations of a older, often nobler principle. Who by the deviance of their wills, or the pride of their powers, start their descent into the offices of ignorance.
Every chief power of the dark realm finds his or her end at the hands of a Divine manifestation within Hindu mythology. Death to evil in this case acts as a salvation, a redemption of the fallen soul.
Sometimes, one does not wait for Death to redeem. Either at the gates of death. Or in events that bring the full force of death, redemption is granted.
This idea of release from the karmic bonds of existence, however dire and twisted it may be, offers a hope which is absent elsewhere.
Hiranyakashipu, a demon who compels the descent of Vishnu as Narasimha, gains his powers by performing sever austerities to Brahma. Killed by Narasimha, the soul released from the shackles of the perverted self, would go back to its source after working out the fruit of its karma.
Ravana, said to be an ardent devotee of Shiva, had Vishnu as Sri Rama to come and stop him. Again, killed by a Godhead and the soul returns to source after karmic debts are paid.
The idea that God, who exceeds all our measures of morality, should be vengeful or wrathful to a tribe or people or non-believers, is to make Him or Her or It very limited in conception.
Above all to limit individual action by the notion of eternal condemnation is a brutal idea. Perhaps effective in keeping the simplistic lot under the umbrella of a particular creed. But utterly useless to anyone who ventures to think deeply.
An Omniscient God would, by definition, pervade all things. Including the evil that befalls the world. Including the other sundry godheads that may piggyback on His Omnipotence. His infinite variety would not be limited to a single name. Or form.
The Highest God would be compassion and love, instead of breathing fire. One day he might come as warrior, as the cleanser of our souls. Another day as the lover, who woos us with the music of heavens. Yet another day perhaps he might come as the mother who lulls us into a primordial sleep. Each manifestation would take the most beneficial aspect towards the child-soul.
The next time, someone condemns you in the name of religion, remember the karmic dues might take an eternity to pay but your reaching the highest goal, to the very bosom of the Infinite, is a done thing.