Sort:  

If my son wants to mark himself that's up to him. Wouldn't supposed Gods be able to mark themselves?

Then you might want to do some research

I've never heard this before. Do you know exactly which part of the text this is found in?

Hi it's been a while since I read stitchens books but I did a quick search and found this. http://ancientmistery.weebly.com/origin-of-circumcision.html
Also this is a link to Columbia universities codex
http://cdli.ucla.edu/collections/columbia/columbia_intro.html