"What therefore you worship as unknown, this I proclaim to you."
God is not a "what" -- God is "He."
Strike 1.
True, there is a big difference between worshiping God in ignorance and worshiping God in spirit and truth.
Only if you know you're worshiping God. They were worshiping an altar made to the unknown god. Paul took the opportunity to bring the Gospel and explain that God is God and the only God.
Keep trying...
Hoss
You just rejected the King James Version, which the Protestants believe(d) was the Word of God and attributed it to a cult.