[Another one that's going to be difficult to get through to it looks like...] Sadly that is not the first time I have heard that argument...

Very well sir, you may believe what you like. Simply know that you will need to do business with many demons as you go about life here. You may come to your own conclusion as you interact with them.

I only hope that one day you will realize that demons, angels, and humans are not as different as they seem.