This may be an example of that style, or may be a fake. It may actually, in a twisted way, prove the authenticity of the find as the style may certainly date to the period of early Christianity but not 1st century Israel.
But don't think it was only the heathen gentiles using the symbolism of their pagan brothers and sisters in the sanctuary.
Tiberius Synagogue mosaic zodiac – the inner circle - Sol Invictus.
Filmmaker, and certainly not my favorite, Simcha Jacobovici featured this "zodiac" (or one like it) located in the Tiberius Synagogue in one of his episodes of The Naked Archaeologist, he also claimed the zodiac to contain "encrypted" messages in the slots of the zodiac. The letters are turned backwards in some cases.
I cannot recall Jacobovici 's specific decryption but it shows a symmetry between the find in a cave in a Jordan military zone and the supposed reality of "1st" century Christianity, according to Jacobovici, which one must take with a huge grain of salt. It may have been common for the Jewish Christians of that time period to hide within the pagan religion. It makes sense; the guards see a depiction of their god on the floor and they move on, no questions. For practical reasons but I cannot imagine James the Just, Brother of the Lord and leader of the early Church, using pagan imagery.
Just keep your faith in Yeshua and GOD'S WORD, everything else will work its way out in the end.