If God were to act like a door-to-door salesman, when would he show up? "Oh, I haven't believed yet because he hasn't shown up yet". He showed up once for all. You say He gives us a world indistinguishable from one where He doesn't exist- but this doesn't make sense either and isn't even scientific. What do you think the difference in the world would be? Also again, the vast majority of people on earth have heard about Jesus. It's hardly an obscure secret.

He gives us free will and respects our decision.

Mercy isn't the opposite of justice. Unjust is when you let people get away with things. God has mercy on those who are truly repentant and trust in His sacrifice as their salvation.

Good works aren't exceptional. To do good is what's expected of us. So when we do something wrong, we can't undo it. A good driver is someone who follows all of the rules. If you go through a red stoplight, you can't make it up by stopping at three more. Our sin required the perfect and infinite sacrifice - which is God Himself.