There is zero mention of Adam and Eve having daughters.

Guy got it, but it's instructive to compare the quote: "And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters".

What idiot told you that when the Bible names certain people it excludes there being any other people? That's Ketanji logic.

Tradition suggests (which may or may not be true) that Adam and Eve had a boy and a girl every year for hundreds of years and their children were similarly fruitful. However, in any situation where we date the first murder late, e.g. 130 AM, there are opportunities for plenty of people to be available for Cain to be fearful of.

Cain's wife was named "Mrs. Cain". She could have been his sister, or a daughter of other incest, or a product of human parthenogenesis, and there are more complicated solutions.

It's entirely possible that Cain himself named the land of Nod by virtue of laying claim on it.

Yes, all humans are the Lord's by creation. Gen. 4:26 KJV: "Then began men to call upon the name of the LORD." Your translation is one minority possibility, namely that people started giving themselves collective names e.g. Yahwists as if those names didn't apply to all people. Another possibility is simply that the eventual disappearance of the cherubim from the gate of Eden would have led to people calling on God rather than going specifically to a gate of God.

Genesis 1:29. Then God formed

There's no "then" there, sorry. Perhaps you've never considered that ancient writers knew how to use the flashback device. It's well-known that Gen. 2 retraces particulars of the events of Gen. 1. This is indicated by the transition text that recapitulates in 2:4-5, "These are the generations of the heavens and of the earth when they were created, in the day that the LORD God made the earth and the heavens, and every plant of the field before it was in the earth, and every herb of the field before it grew." It's going back to Adam's point of view after having described God's point of view.

It doesn't say anywhere in the Bible that Adam was the first man.

You did it again! And Guy didn't spot this one. "And so it is written, The first man Adam was made a living soul; the last Adam was made a quickening spirit" (1 Cor. 15:45). Also, Job 15:7 in Hebrew: "Art thou the first man [adam] that was born? or wast thou made before the hills?" He's named Adam because he was the first adam.

It is entirely consistent with Genesis for God to have created "men" who were basically human shaped animals with no concept of Good and evil, and then created Adam and Eve whose descendants (the Isrealites) carried the original sin and eventually produced Jesus Christ.

Not entirely consistent, just barely defensible with lots of special pleading, as many wackier theories are. We don't kick out Christians who come up with weird views via special pleading because these matters may be inessentials. But we do agree to go to the source and find things out by consulting the voice of truth.

Who was Cain's wife? There is zero mention of Adam and Eve having daughters. Cain also says to God: "You have made me a fugitive. All who see me will try to kill me" ~ Genesis 4:14 . Who was going to kill him? Adam or Eve, the only two other humans at that point, whom he was being banished from?

Actually they did. Genesis 5:4

Then he fled to the land of Nod. Who named it thus?

Nod, as in, a place of wandering. God could have named it.

Eve later gives birth to Seth, who had a son named Enosh. "It was during his lifetime that men first began to call themselves the Lord's people" ~ Genesis 4:26. But aren't all humans the Lord's people, created by Him? Who else was there?

People are prideful. They can call themselves anything. And they can also try to de humanize people to feed their own ego.

It doesn't say anywhere in the Bible that Adam was the first man.

Nor does it explicitly say that God made blueberries. But we know He did.

It is entirely consistent with Genesis for God to have created "men" who were basically human shaped animals

God is not the Author of confusion. Why would He put non human humans there to confuse us and to get us to waste a bunch of things to help them?? That view of God makes God look more like loki the prankster, not God.

with no concept of Good and evil,

Then how are they accusing people of being bad and racist?