We're aware. Islam got its monotheism from Christianity, so we know what you're talking about.
This is absolutely not the case in Christianity. All cultures have a god of death, plagues and diseases. Not once did this deity originally possess the highest position, only after processes of monotheisation within a polytheistic or hedonistic environment. The god of the Jews would be one such example. Most famous deity of calamities would be Ninurta, better known as Nimrod, who does not bestow curses or illnesses upon people because he's God. He's the "prince of this world", and if you read the Old Testament well, you should be able to identify him.
Ergo, this is also completely contradictory to Christian teaching. God is Life, not death. Death is the absence of God, a concept that Islam seemingly doesn't possess.
God doesn't decide who dies and who gets eternal life. That is dependent upon the individual.
Death is not a calamity. That's your perception of it. Maybe you don't see beyond your two physical eyes.
God Created everything in pairs. Everything is dual except God. God is not life. Life is what YOU are. Life is all around you. Life comes from God, The Source of all life, The Creator of all life-form, The Ever-Living Himself. Life is a creature whereas God Is The Creator. God Is Beyond life while life certainly comes to an end with death. God Never Ends. God Himself Is The First and The Last, The Alpha and The Omega, The One Whose Being we cannot even begin to imagine.
Death is the absence of God? Really? How can you even conceive of such a concept, God's Existence Being Obligatory at all times? You're no different than atheists if you believe such imo.
God Created death. Death itself will taste death on the Day of Judgment. Death is only an illusion of sorts. It's an end to life as we know it here on Earth or in this current dimension that we're living in. We did not choose our bodies. It's only a vehicle for the soul. Though perfectly proportioned, it has its inconveniences that we must cope with all throughout our lives until death. We need to maintain its cleanliness. It grows old. When it gets sick, we must seek some kind of treatment without forgetting that Only God Can Deliver us from it.
Death is a gift for the one who believes in the Hereafter. After death, another version of life is Granted to the human being or the jinn. The body dies, but the soul remains and is transferred to another body. People who have died say 2000 years ago are still in that hereafter right now as we are currently discussing. They are either undergoing some form of Judgment for the way in which they carried their bodies while on Earth's surface or they are peacefully awaiting the Day of Judgment. Either way, the Earth is treating the inhabitants who have passed away in the same way that they've lived their lives on it. If the people lived in God's Obedience through and through, they are more likely to receive a good treatment while in Earth's belly from Earth itself since Earth is nothing more than a servant to its Almighty Creator and Maintainer.
Lastly, everybody gets eternal life whether you get admitted to Paradise or Hell. Some of Hell's inhabitants might be subject to some purification of sorts before being admitted to Paradise though. Other of Hell's inhabitants will still get eternal life even if they won't ever be delivered from hell-fire. But they did earn it, didn't they? Like really, how else would you punish somebody who's
tortured millions?