You have this one verse, in the context of 1 Corinthians 24. Let's examine what it actually says. My NAB says:
13 The grace of the Lord Jesus Christ and the love of God and the fellowship of the holy Spirit be with all of you.
Close enough. What does it actually say? Does it say that the Holy Spirit is God? Does it further say that the Holy Spirit is coequal, coeternal and coexisting in the Trinity? No, and you will not find that in Paul. As for Jesus, Paul hints occasionally at His Divinity, but never as coequal, coeternal, and coexisting in the Trinity. Paul is a subordinationalist who writes somewhere between Jesus as a super David and a subordinate God. That is not a condemnation of him, but it is what he wrote.
Sorry, I just don’t agree with you (surprised?). Paul was a Jew, you forget, and Jews were monotheists. Paul states many, many times that Jesus was God, just as Jesus himself proclaimed, and Paul- being lead of the Holy Spirit when he was writing scripture - would have never implied a belief in multiple gods - however subordinate.