Without a doubt. It would be more accurate to call the religion Paulism than it is to call it Christianity.
Putting that aside, would St. Paul have found someone, someplace, somewhere to market in a his repackaged form of his own vision, to do that, without Jesus, or would he have remained a fisherman?
Paul was most certainly not a fisherman! He was an educated Roman citizen and some kind of Pharisee official. His trade on his missionary travels, fwiw, was tentmaking.
Would someone not crucified in a rather dramatic way have been marketable, in a repackaged form or otherwise?
Not really. Thousands of people were crucified in dramatic ways back then, and many of them were self-proclaimed magicians or prophets of some kind or other. Like I said, all else being equal. If Paul had selected some other prospective martyr and depicted in the exact same way that he had fulfilled the Jewish law and that the path to salvation for both Jews and Gentiles alike was through him, then we'd be talking about Simeonism or whatever.
St. Paul I thought was a fisherman on the Sea of Galilee. But I am in the bottom decile on this forum when it comes to biblical knowledge, so I am not going to argue with you.