Circumcision is not allowed in Islam

He created everything in exact measure; He precisely designed everything

(25:2)

He designed you, and designed you well.

(40:64)

He created the heavens and the earth for a specific purpose, designed you and perfected your design.

(64:3)

He created man in the best design.

(95:4)

[Satan said:] " I will mislead them, I will entice them, I will command them to mark the ears of livestock, and I will command them to distort the creation of GOD."

(4:119)

We did not leave anything out of this book.

(6:38)

The word of your lord is complete, in truth and justice. Nothing shall abrogate His words. He is the Hearer, the Omniscient.

(6:115)

Say, "Did you note how GOD sends down to you all kinds of provisions, then you render some of them unlawful, and some lawful? Say, Did God give you permission to do this? Or, do you fabricate lies and attribute them to God?"

(10:59