If God exists, I'd expect Him to be more offended by the actions of His war mongering followers than by lack of belief from unbelievers.
Yes those who claim that they are for God and are His representative and then do things that are against God will be judged more harshly. Thats why it says those who are first will be last and those who are last will be first. As those who say they know Jesus and are doing all those good works haven't really got him in their lives. There are even non Christians who will inherit the kingdom of God before so called religious people who claim to be saved.
There is a parable about the two sons that speaks of this.
Matthew 21:28-32
The Parable of the Two Sons
28 What do you think? There was a man who had two sons. He went to the first and said, Son, go and work today in the vineyard.
29 I will not, he answered, but later he changed his mind and went.
30 Then the father went to the other son and said the same thing. He answered, I will, sir, but he did not go.
31 Which of the two did what his father wanted?
The first, they answered.
Jesus said to them, Truly I tell you, the tax collectors and the prostitutes are entering the kingdom of God ahead of you. 32 For John came to you to show you the way of righteousness, and you did not believe him, but the tax collectors and the prostitutes did. And even after you saw this, you did not repent and believe him.