I'll try and help, but someone else might give better answers.
1.People die because of the fall of man, people can reach heaven because of the death of our Lord.
2. Infinity is real persay, If he can do math, have him divide 100 by 3 and he'll realise that he will always get a 3 and the cycle cannot end. It isn't real so in so much as technically you're always missing a piece and that's why it dosn't end because it can't be divided but it is real in that it dosn't end because it can't be divided. Google is known to people as websearch engine, but in reality the word is actually the last number before we just say infinity.
3. uh I don't know.
4. Evil is not caused by God, he gave us free will, to do good or bad at our choosing, he wants us to do good and will love us if we do, but he will be ashamed of us if we do evil and wants us to not do evil. Satan brings forth evil because he blames humaity for his fall.
I basically told him: 1) Death is a part of life, ever since we messed up the world by our own choice of loving ourselves more than God (original and actual sin); that God permits it does not necessarily entail that He does not love us, but that He wishes us to pay the debt of death (I then made an extended analogy of a customer at a bank), in order to have access by grace to a life greater than this. 2) Infinity can exist in the logical order but not in the physical order: it has an ontological status above figments of human imagination, but it does not exists outside the mind the same way an iPod does; true infinity is found in God alone. 3) God did have us in His divine mind and He chose the time and place wherein we would be born from all eternity, because He loves us so much that He gave us the gift of existence, and gifts far greater than this: we were present before the Divine Mind because time and space are accidents compared to the eternal and immense life of the Deity. 4) God didn't want robots to serve Him (I then made an analogy about how its fun to play with other kids than it is to play with just toys); we were given free will so that we can choose to love and serve God, and if people choose to turn away from Him, that is evil; that's why you have robbers and bad guys, because their hearts are turned away from God, Who alone can fill the unfathomable immensity of the human soul.
Usually he just stares into the wall, trying to grasp what I just said. That's better than what he did when I just read him the
Summa Contra Gentiles (he would fall asleep).
Hey, to get back on topic, is the a
Summa for kids? That would be awesome!