- It doesn't make sense to say that "Some Christians have killed people before, therefore Jesus is not God." It's like saying that "Some Democrats have killed people before, therefore Obama is not President." Facts stay true, no matter how badly people may behave.
- Those Christians who have acted evil in history are acting contrary to the teachings of Jesus. This means that Christians who have acted evil before are not behaving consistently with Christianity. Therefore, Christianity itself is not at fault for these evils.
- Of all the religions in the world, Christianity thinks humans are the most evil. Therefore, the fact that some Christians have been cruel in the past confirms the Christian idea that humans are naturally evil and in need of rescue.
- If you add up all the numbers, people in other belief systems have killed a lot more people than Christians have (especially atheists of the communist type, like Mao and Stalin). If the truth of a belief was determined by how nice its followers were, Christianity would win regardless.