I am angry

• why someone who had never heard of Jesus would go to hell,

They don't, well not automatically.

Romans 2:12-14

12 All who sin apart from the law will also perish apart from the law, and all who sin under the law will be judged by the law. 13 For it is not those who hear the law who are righteous in God’s sight, but it is those who obey the law who will be declared righteous. 14 (Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law.

TL:DR; If you haven't heard of Jesus you will be judged by your actions and convictions.

why unbaptised babies would go to hel

Baptism isn't required for salvation,it is an outward expression of an inward transformation. Children who pass on before being able to make offerings for their own sins in the Temple days were covered by the offering of their father, the same is now with the everlasting Blood of the Lamb. A family in Christ who has a child die is covered. A child from a family that does not know Jesus will be judged on the character of their father.

if he exists, and he’s strong enough to do something about all this, a

Ah, the Epicurean Problem of Evil. The answer is Free Well. God could have made us automaton that did everything we were programmed to do, but then worship is meaningless and God wanted companionship. Without the ability to disobey obedience is meaningless. The value in our worship is EXACTLY because we CHOOSE to do it when other options are available. You and every other atheist on the planet refuses to accept it to the point you forward research that suggests that human will doesn't exist and that gives me a laugh every time it makes news.

, translated imperfectly

Another misnomer, and one so often passed about. ALL translations of the Bible currently in print go back directly to copies taken of the oldest extant versions of the documents housed in the Vatican, circa 30-70 years after the death of Jesus. There is no core tenant contradicted in any of the accepted valid Biblical texts from the most ancient to modern of archive.

This is a historical fact and can be confirmed by any legit Bible scholar, INCLUDING atheist Bart Ehrman, because the practice of MAKING a translation REQUIRES the document chain.

Transliterations are different but I bet you don't even know what a transliteration Bible is or its purpose.

I think Jesus was a pretty cool dude with good ideas,

But you can't think that. That's not a rational option.

He claimed to be the living son of God, he claimed to perform miracles.

So either he is who he says he is or he is a madman. You cannot cherry pick just because it doesn't challenge your comfortable sense of reality.

Ok lets say for your argument, he just is 'a cool guy', well that cool guy asked for the sick to come up before him to be healed.

If he was 'just a cool guy', and not a supernatural being, then he is actively deluding people just as bad as a tent preacher.

I know WHY you want to think this, yes everything he said is valuable and useful for living a good life.

But you cannot deny the fact that he claimed to be the son of God, and to perform miracles.

And any 'just a cool guy' claimed all that did that, don't you think he would be a certified manipulative cult leader?

Why do you care what people think of your religion?

Because nearly everyone including you and my churchmates get it wrong when it is all already spelled out for everyone and we have 2k years of record as to the quality of life in nations that are largely Christian.