It can be quite difficult to come to terms with these things, but I think it can be good to remember that at the end of the day, life just isn’t fair.
My mother was the most devout Protestant I have ever met, and died in that state, firmly rejecting the Catholic Church. As someone who converted after this, how do you deal with the fact that it just isn’t fair? Because it’s not. When in reality, we all deserve hell, but only by a free gift from God called grace can we ever save our souls. He gave us free will, and that was the greatest and most terrible gift He could give, because we are free to love God, as we are meant to, but He also gave us the terrible gift of being able to reject Him.