Nice try, but it's not enough.
Circumcision was a "Jewish" thing since it was required of Jews. Fussing over whether or not it should be called a Jewish thing because the term did not yet exist is silly.
Also, Jesus was baptized by the Baptist. He couldn't be baptized until the Baptist began his ministry. That was when He and the Baptist were both well into adulthood. Do not assume that because Jesus was baptized as an adult that He was indicating everyone must be the same age as He was to be properly baptized. That would be a logical fallacy to say the least.
Also, if you are going to train up a child as a Christian then start with what opens his soul to grace. That's baptism.
The point I was making was...circumcision of an eight day old infant was not a voluntary thing. It was a requirement of God. It was to be a sign of his covenant with Abraham and his descendants......some of which were Jews.
Also, Jesus was baptized by the Baptist. He couldn't be baptized until the Baptist began his ministry.
God could have seen to it that Jesus would have been baptized as an infant. He did not, and the the fact that Jesus set his example, as an adult, speaks volumes.
There is no mention or example of infant baptism in scripture. It is a myth perpetuated by the mainstream church. "When I was a child, I spoke as a child, I understood as a child, I thought as a child: But when I became a man, I put away childish things." [Corinthians 13:11] This verse by itself should be justification for adult baptism.