• Circumcision was not unique it was done in other cultures before Abraham. Abraham understood at that time the meaning and traditions already established.
• Circumcision was a visible, continuous reminder of a covenant.
• Just as God asked for circumcision, he made a covenant through cutting and burning an animal and passing between the pieces. People would do this, the one who passes through is the one making the obligation and promis. God used the cultural and familiar traditions to establish his people in a way they could understand.
• God passed through the animal and prevented Abraham from passing through. God knows that man is fallible and broken. We cannot keep promises forever. But God will. Hence God was the only one making the obligation.
• So to answer your question, God asking me to do something known in my culture as a clear sign and daily reminder, of a covenant - even if that happened to be Circumcision, (or even if it meant scarring my face), I wouldn't consider it weird. In fact I couldn't consider it weird since it would already be a familiar practice in my culture. Which is why God used it.

Genesis literally states why circumcision was started. It's definitely not satanic. Jesus was circumcised...