Why are other civilizations ignored in the Bible?

[Minimalist]

Why was there only one Jesus? If Yahweh was trying to save the whole planet, why only send down one guy? Why did he only beget one son, thousands of years after Humans have been around, to teach in some backwater hole instead of the great schools of the more advanced civilizations?

Christianity spread through the Roman empire like a wild fire and was the dominate religion before the Roman empire fell, how's that for getting the message out.

GC

Xtianity spread because the emperor wanted it so....had nothing to do with your fucking silly god or his absurd dogma. Be very proud, G-C. Your shit was imposed by force.

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Would you have accepted the Bible as the word of God if it had included historical information about every (or at least more than one) region/civilization? I ask this because your argument assumes that the word of God would focus on more than one specific region of the entire planet and since the Bible doesn't, it can't be the real word of God. Is this what you believe?