Some, but not all, Christians believe that Jesus was God's first creation, and yet was God, and that it was Jesus who created everything we know of in the big unknown universe. Where would they get such a crazy idea? Well, from the craziest Gospel, of course! In John 1:1-3 we find:
In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning. Through Him all things were made; without Him nothing was made that has been made. NIV
The "Word" here metaphorically(?) represents Jesus, as the rest of John 1 will show you. For those who try to deny the claimed divinity of Jesus, these verses are a huge stumbling block, at least if you place any faith in the Gospel of John.
Anyway, obviously Jesus and God are quite different, despite them being made of the same stuff, which is why this Sonfish looks nothing like the Holy Mackerel.
Finally, you'll notice that I made the Sonfish a bit larger than the Holy Mackerel; a nod to Christian "superiority" in the quantity of adherents over Judaism. ;-)