After seeing the armies of the Canaanites and the Amalekites the people rebel. They say that they should go back to Egypt or they will be killed by the opposing armies. God is angry that the people would dare doubt him and he says he is going to kill everyone. Moses talks him out of it again. And again, Moses essentially says "what will the Egyptians think of you if you rescue your people only to kill them out in the dessert?". Why does God care what people think of him? On a more profound level, how can Moses talk God out of something? God obviously knew what people were going to think of him before Moses pointed it out, otherwise God wouldn't even be as intelligent as Moses. This is horribly inconsistent with the "all knowing" and "all loving" part of God's character.
It gets even worse. Moses asks God to forgive the people for what they've done, and he immediately says "I have forgiven them". What? I usually try not to get too ahead of myself, but what is Jesus for if God can immediately forgive people just because Moses asks? There is yet to be any mention of an afterlife, so maybe that's what Jesus is for.
God seems to have a strange definition of "I forgive them". He sets them out into the dessert and says that only two of the people currently alive in Israel will live to see the promise land. God also says they will know what it's like to "have [God] against you".
A group of men decide to try to take the promise land for themselves. Wait a minute here, wasn't the whole point of rebelling that they wouldn't fight the people in the promise land? They die because God was not with them. Or because they were a small band of farmers with no military experience. I'll let you decide.
Numbers 15 just reiterates how to give offerings (really? quit repeating these things). The only thing interesting that happens is that a group of Israelites find another Israeli gathering wood on the sabbath. The people that find him bring him back to Moses. Moses consults God and God personally says "The man must die". For collecting wood on the wrong arbitrarily decided day of the week?! God definitely showed his love and forgiving with that guy.