[1forall]

This “medical” procedure is an abomination against God

Scripture reference please?

[St_Thomas_Aquinas]

—— Scripture reference please?-—

Scripture verse that mandates Scripture references, please?

Regardless, do you think God favors mutilation?

[impimp]

1. Gen. 38:9–10, Deut. 23:1
Also from NT:
1 Corinthians 6:19-20 ESV

Or do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own, for you were bought with a price. So glorify God in your body.

Philippians 3:2 ESV

Look out for the dogs, look out for the evildoers, look out for those who mutilate the flesh.

2. http://www.catholic.com/tracts/contraception-and-sterilization
Lists what many early Christians said of the practice.

3. Also check the Catechism of the Catholic Church.

Since you may be a sola scriptura believer then you can refer to 1.