How could a loving god send people to Hell?

[Sigurd]

Generally, most faiths reward good behaviour and punish misdeeds.
Going to heaven should be like a point system. Positive points for good, negative points for bad.
"You walked an old lady across the street? Here, have 5 points."
OH YEAH!
"But you murdered a nun... I'm taking away 200 points."
Goddamn it.
...
Come Judgment Day...
"Let's see now. You're in the positive numbers, so that's good. Still not high enough to be with Jesus. You can stay in the working-class district of Heaven."
See how much more effective this would be with a Divine Leaderboard? People would be competing to get more points, but of course, there would be trolls who would try to get the lowest score as humanly possible.
Now that I'm thinking about it, it does have a few flaws. Well God, if you're out there, feel free to implement my point system in this world. I sure could use a laugh.

...(condensed)

That's the thing... According to Christianity Jesus paid for all sins ever committed against God. Every sin is paid for in full -God's justice is satisfied.
I heard this analogy by an american associate: It's like you having 100 parking tickets in California. The Justice system demands that you either pay them or serve time. But you don't have the money... When you show up in court, all tickets are paid for by this guy down the street. Justice is served as the tickets are paid - and you are free to go... Thanks unknown guy!! whaddayamean I need to believe it happened OR ELSE... ???

Predestination/free will
Both are true,God knows peoples heart before they are born, he predestines them to be saved. Those that live by faith god foreknow them by faith, he predestined them to be saved.
If predestination is true than no need to evangelize.
Gen 2.19 Ezekiel 18.2-32 luke 13.34 matt 18.14 mark 8.34 Deuteronomy 5.29

The co-existence of free will and predestination answer is not satisfactory.
If he predestines someone to salvation, wouldn't he predestine someone to damnation also? Hence back to your original question. Why populate hell with his own offspring? Let me hear the angle of oppositions must exist.