On could argue that even jesus did allow for xeno-theism, given that he argued for giving the roman emperor what the roman emperor was due- and the roman emperors at that time considered themselves basically gods or god decendants.
I don't think you can argue that. Jesus argued it was acceptable for Jews to pay taxes, but certainly not that it was acceptable for Jews to worship the emperor. In any case, only some emperors where proclaimed divine, and it only happened after their death. Tiberius (the emperor at the time of Jesus) was never proclaimed divine. Caligula was the first to be proclaimed divine while still living, and this was after Jesus.
