> We see the pre-incarnate Christ appearing to
> Abraham in the book of Genesis.

Yes we do see that, although we have no idea who wrote it, we do see it in our Bibles.

In exactly the same way,

We see "G-d" repeatedly telling the Israelites that He wants them to go and murder men women and children.

Examples:

Amalek
As the Israelites prepared to invade Canaan one of the Canaanite tribes, the Amalekites came out to fight againt them.

This is all that is said of that "crime" at the time.

Ex 17:8 ¶ Then came Amalek, and fought with Israel in Rephidim.

It seems understandable that a nation would oppose an invading force known for its massacres.
But apparently, the god of the Hebrews wanted them to just die without opposition because a few verses later,

WE SEE:

Ex 17:14 And the LORD said unto Moses, Write this for a memorial in a book, and rehearse it in the ears of Joshua: for I will utterly put out the remembrance of Amalek from under heaven.

And several hundred years later, after the Hebrews already control the entire area, the Hebrew god is still angry.

1Sa 15:2 Thus saith the LORD of hosts, I remember that which Amalek did to Israel, how he laid wait for him in the way, when he came up from Egypt. 3 Now go and smite Amalek, and utterly destroy all that they have, and spare them not; but slay both man and woman, infant and suckling, ox and sheep, camel and ass.

So by trying, unsuccesfully to defend themselves against invasion and massacre, the Amalekites so infuriated the Hebrew god that he sent "his people" to commit genocide hundreds of years later.
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Another case:

Nu 21:1 ¶ And when king Arad the Canaanite, which dwelt in the south, heard tell that Israel came by the way of the spies; then he fought against Israel, and took some of them prisoners. 2 And Israel vowed a vow unto the LORD, and said, If thou wilt indeed deliver this people into my hand, then I will utterly destroy their cities. 3 And the LORD hearkened to the voice of Israel, and delivered up the Canaanites; and they utterly destroyed them and their cities: and he called the name of the place Hormah.

The term "utterly destroy them" is a sanitized way of saying "massacre".

It seems like the tribal god of the Hebrews delighted in such things, notice that Israel made a deal with him, 'let us win and we will slaughter them'.
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another example:

Moses spells out the Hebrew God's will clearly:

De 7:1 ¶ When the LORD thy God shall bring thee into the land whither thou goest to possess it, and hath cast out many nations before thee, the Hittites, and the Girgashites, and the Amorites, and the Canaanites, and the Perizzites, and the Hivites, and the Jebusites, seven nations greater and mightier than thou;
2 And when the LORD thy God shall deliver them before thee; thou shalt smite them, and utterly destroy them; thou shalt make no covenant with them, nor shew mercy unto them:
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We do see it don't we?
It's there in black and white.

But the big question is, "Is this vengeful, violent, tribal god of the Hebrews, the same God that:

- "so loved THE WORLD that He sent his only begotten Son...that (they) should not perish"?

- "sent his angels with "good tidings of great joy that shall be to ALL PEOPLE".

- said: "Go ye therefore, and teach ALL NATIONS, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:"

- said: "My house shall be called of ALL NATIONS the house of prayer? but ye (the Pharisees) have made it a den of thieves.
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It seems like the Hebrew scribes of the OT, the same crowd who gave us the Talmud and the Kaballah, ascribed certain characteristics to their god, that simply do not fit the God of Jesus.

So who do we believe?

I think that God allowed such misrepresentations of His character to exist for the very purpose of discerning who seeks Him "in spirit and in truth" (as Jesus said we should), and who seeks him according to the deadly "letter of the law" (like the scribes).

Each individual has to try the "scriptures" and see which of these clearly different portraits of God is correct.