The Romans didn't care about this 'Jesus' being another God that people worshipped. People everywhere worshipped all sorts of gods. Why would one more matter? But the Jews understand something in the language that the Romans do not. And this small nuance, this little detail, makes all the difference in the world. When Paul presents Jesus as the Christ, as the Messiah, he's presenting him as KING. That's what the Messiah is. That's who the Christ is. THE KING of all kings. So he's spreading this subversive message: "There is another king, regardless of who may be ruling this land at any given time, and THAT king is Jesus."