There is a voice in your head:
"I am going to make you very rich and have many children. But you must cut off the foreskin of your penis and the same for all your children."
Will you do that?
In today's standard, that's in humane. However, that is exactly what god requires Abram to do - circumcise!
Again, I do no understand why an almighty god would require one of his creation to do that AND then give special "blessing' to Abram? Why not all his creation?