But to us [there is but] one God, the Father, of whom [are] all things, and we in him; and one Lord Jesus Christ, by whom [are] all things, and we by him. (1 Corinthians 8:6)
Jehovah's Witnesses and other Unitarians interpret this verse to mean that the Father alone is God. However, if one were to remove one comma, the meaning would be much different:
There is but one God the Father, of whom [are] all things...
See the difference? The verse changes from vaguely implying Unitarianism to stating that in the Trinitarian Godhead, there is only one God the Father. If I am not mistaken, the original version of Corinthians doesn't have commas anyway, so it would be best to consider the context of Paul's writings.