Keep reading. Acts doesn't end at chapter 11.
Your words in post
#349 "I think we have an entirely different message when we try use Acts 2.38 for today."
I agree it is a strange thing to say. I showed you how the message to the Jews and Gentiles is not different.
Acts 8:37-38 teaches believing in the gospel of Christ and getting water baptized to a gentile Ethiopian eunuch. Also, we already went over that eunuchs cannot be Jewish proselytes under the law of Moses.
Acts 8:37-38
37And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God.
38And he commanded the chariot to stand still: and they went down both into the water, both Philip and the eunuch; and he baptized him.
Deuteronomy 23:1
1He that is wounded in the stones, or hath his privy member cut off, shall not enter into the congregation of the LORD.
Leviticus 21:20
20Or crookbackt, or a dwarf, or that hath a blemish in his eye, or be scurvy, or scabbed, or hath his stones broken;