Not at all. If this is a peculiarity of the Christians, as Pliny seems to be suggesting to Trajan, then the point must be that they worshipped the christ - the Messiah - as a god, in a manner that Jews did not. That Pliny was aware of Jewish ideas means no more than that he had perused
his uncle's works, as we know he did.
Worshipping cosmic beings as gods was a common or garden practice. But here we have some bunch worshipping a
messiah as a god! Weird. In fact Pliny dismissed the whole thing as "depraved, excessive superstition".
I think that, if anything, Pliny's strictures point to the "Christos" having been in his mind a human being, rather than a supernatural cosmic entity, which explains his indignation at Christians making him an object of worship.
If he had said "they sing hymns to a supernatural being in the sky, as if to a god" that would have been commonplace to the point of absurdity.