Notice that you didn't actually argue anything. You mocked a set of beliefs, distorted several of them, and then declared victory.
"God lives on Kolob."
No, that's not LDS doctrine.
"God of your own planet."
Not LDS doctrine.
"Celestial space babies."
Not LDS doctrine.
So right out of the gate, you're attacking beliefs that Latter-day Saints don't even officially hold.
More importantly, your entire argument assumes that the Nicene Creed gets to define Christianity. That's the very point under dispute.
The apostles were Christians before Nicaea existed.
The New Testament existed before Nicaea existed.
Christianity existed before Nicaea existed.
So merely shouting "You reject the creeds!" doesn't prove someone isn't Christian. It proves they reject the creeds.
You also conveniently ignore the fact that Latter-day Saints affirm that Jesus is the Christ, the divine Son of God, the Savior of the world, the risen Lord, and the only source of salvation.
If worshiping Jesus, praying in His name, being baptized in His name, preaching His gospel, and centering your entire religion on Him doesn't make someone Christian, then your definition of Christianity is "whoever agrees with my fourth-century metaphysics."
And that's the real issue.
You're not defending Christianity. You're defending a particular version of Christianity and pretending it's synonymous with Christianity itself.
The irony is that your argument boils down to:
"You don't believe exactly what I believe about God, therefore you're not Christian."
That's not an argument. That's a boundary marker.
The question isn't whether Latter-day Saints differ from creedal Christianity. They obviously do.
The question is why a council held centuries after Christ gets to determine who counts as a follower of Christ.
And that's the question critics like you usually avoid because it's much easier to make jokes about 'space babies' than to defend the authority of Nicaea without begging the question.