Cherry-picking the Religion: Circumcision

It's interesting that many cite their Christian faith as being the reason for having their sons circumcised but the scriptures don't say circumcision is required. 1 Corinthians 7:18 says, in essence, that if you're not circumcised don't get circumcised. Circumcision is nothing and uncircumcision is nothing. Some would argue that what Paul was talking about only applied to adult males joining the faith and that infants must be circumcised? Really? If removal of the foreskin isn't essential for the adult who is of the faith why should it be essential in the infant who has no choice in the matter?