Why should anyone update something perfect? Can you update the true?
You don't have to necessarily to update it, but to explain it better. There are hundreds of different christian sects in the world which proves that God's communication style has been massive failure. People don't have any idea how to correctly interpret the message.
Greater love hath no man than this, that a man lay down his life for his friends.
But why God had to sacrifice one of his identities to himself? It just doesn't make any sense. We are not talking about a normal human being here, but a supernatural deity.
"stop acting bad or I will make you suffer eternally" actually he said something like that.No?
No, he didn't say that. Instead he massacred probably millions of people because they didn't do what he wanted. I think that as a creator of the universe God should have had some better alternatives to deal with people. But he just likes to massacre more than have a serious discussion. As an almighty being it shouldn't be too difficult to persuade people act nicely.