I don't know any Christians that believe in following any part of Torah outside of the "10 Commandments" + anti-homosex.
Christianity is, generally speaking, the religion crafted by Paul. There is a reason the Gideons mostly pass out NTs, and most verses on church signs, and their sermons, come from the NT.
I think you are mistaken, Vimana, in saying there would be no books past Deut. The rest of the OT books are either history, poetry, or prophecy. They don't change anything about the Hebrew religion.
Obviously the books in the NT and the Quran are something else. To suggest WBC is somehow closer to the Hebrew religion compared to any other Christian denomination is pretty laughable.
These are common misconceptions. God was originally a Canaanite war god called "lord of armies," and the Hebrews split off from the Canaanites.
Deuteronomy was a forged book said to be written by Moses that was hidden in the foundation of Solomon's temple and "accidentally" discovered.
The monotheism comes from a subset of the people in Israel who believed exclusive worship of Yahweh would give them an army strong enough to not only not be conquered, but to conquer to the Euphrates.
Deuteronomy 1:7-8
7 turn you, and take your journey, and go to the hill-country of the Amorites and unto all the places nigh thereunto, in the Arabah, in the hill-country, and in the Lowland, and in the South, and by the sea-shore; the land of the Canaanites, and Lebanon, as far as the great river, the river Euphrates.
8 Behold, I have set the land before you: go in and possess the land which the LORD swore unto your fathers, to Abraham, to Isaac, and to Jacob, to give unto them and to their seed after them.'
That small group of Israelites used force to get the exclusive worship from the rest of Israel, as well as the use of manipulation by "discovering" Deuteronomy.
The conception people have of this god is the result of millennia of distortion. Ask any of the original, exclusive worshippers of this god, and he's a bloodthirsty, powerful, vengeful god who wants Babylon conquered, and the other gods eliminated. Hell, the Torah even mentions direction to destroy poles dedicated to Asherah in Exodus 34. Asherah was El's consort, and El is the God Israel was named after.
Eventually, El's name was turned into a generic term for god, and the names of gods like El-Shaddai (God Almighty), and El Elyon (God Most High) were explained as other names for Yahweh.
TL;DR: The idea that God loves anyone besides the Israelites is the result of thousands of years of distortion, which includes stuff people made up later (like Jesus), borrowing from other mythologies, and making up a message directly the opposite of the one they didn't want to follow. Killing people for carrying stuff on the Sabbath was needed to enforce strict worship of Yahweh when Yahweh's cult was getting rid of the other gods, but later, when Israel only believed in one god, people got tired of that, so they changed a god whose original name was "Lord of Armies" into an all-accepting God, when originally he wouldn't even let a man without a dick in his presence.
Deuteronomy 4:2 is where God says not to add or subtract anything. And, since people didn't follow it, this war god was eventually turned into a god that loves everyone. Well, except some Christians and Muslims keep to the original strict, bloodthirsty war god.
So yes, the WBC with their "God hates fags" is definitely much closer to the original god of the Torah than the one who loves everyone.