From my own research - the Canaanite origins of Baal worship seems to be the most likely starting point (which is why I was so smitten by this map).

EDIT (I don't mean it's the origin of the Mystery Wisdom we are all searching for that the "illuminatus" holds, however it is the first place we can see it overtly through archaeology) Personally, I believe this knowledge was given to hunter-gatherers in Anatolia after the s/YoungerDryas event - from there, they would have spread, most likely toward the best, closest area - the Fertile Crescent. This is why we see the first walled cities (Jericho) in Canaan soon after Gobekli Tepe, etc. EndEdit

These various tribes of Canaanites (Amorites primarily, Phoenicians, Phillistines, etc) originally lived there, spreading east around 2400 BCE, out-breeding and overthrowing the generally indiginous people of the Mesopotamian Valley.

In the earliest Sumerian sources concerning the Amorites, beginning about 2400 BC, the land of the Amorites ("the Mar.tu land") is associated not with Mesopotamia but with the lands to the west of the Euphrates, including Canaan and what was to become Syria by the 3rd century BC, then known as The land of the Amurru

By the time of the last days of the Third Dynasty of Ur, the immigrating Amorites had become such a force that kings such as Shu-Sin were obliged to construct a 270-kilometre (170 mi) wall from the Tigris to the Euphrates to hold them off.

The Amorites were an ancient Semitic-speaking people[1] from Syria who also occupied large parts of southern Mesopotamia from the 21st century BC to the end of the 17th century BC, where they established several prominent city states in existing locations, notably Babylon, which was raised from a small town to an independent state and a major city. The term Amurru in Akkadian and Sumerian texts refers to both them and to their principal deity.

The Amorites are also mentioned in the Bible as inhabitants of Canaan both before and after the conquest of the land under Joshua.

The first code of laws were written by Hammurabi, famous Mesopotamian king - who was also an Amorite.

Hammurabi was an Amorite First Dynasty king of the city-state of Babylon, and inherited the power from his father, Sin-Muballit, in c. 1792 BC.

Eventually these Canaanite homelands were overtaken by the exiled/exodusing Hebrews/(Hyksos people of "legend") (See Numbers 21:21 through 21:23) - their religion, destiny, secret texts, rites and even God appear to be have been merged or straight up usurped.

21Then Israel sent messengers to Sihon king of the Amorites, saying,

22"Let us pass through your land. We will not cut through any field or vineyard, or drink water from any well. We will stay on the King’s Highway until we have passed through your territory.”

23But Sihon would not let Israel pass through his territory. Instead, he gathered his whole army and went out to confront Israel in the wilderness. When he came to Jahaz, he fought against Israel.…

A few hundred years later, King Nebuchadnezzar of the Neo-Babylonian Empire (the remnants of the original Canaanite immigrants to Mesopotamia and arguably a majority force behind its prosperity) - invaded Jersusalem and sacked the city.

In 597 BC, he invaded Judah and captured Jerusalem and deposed its king Jehoiachin. Egyptian and Babylonian armies fought each other for control of the near east throughout much of Nebuchadnezzar's reign, and this encouraged king Zedekiah of Judah to revolt. After an 18-month siege, Jerusalem was captured in 587 BC, and thousands of Jews were deported to Babylon, and Solomon's Temple was razed to the ground.

The exiled were only freed by the much later, eventual conversation of Persian King Cyrus to the Hebrewized worship of Baal - who freed them and had slain the remained of the original peoples of Canaan.

After the fall of Babylon to the Persian king Cyrus the Great in 539 BCE, exiled Judeans were permitted to return to Judah.[4][5] According to the biblical book of Ezra, construction of the second temple in Jerusalem began around 537 BCE. All these events are considered significant in Jewish history and culture, and had a far-reaching impact on the development of Judaism.

Oddly, the exploits of King Cyrus in this case are only lightly dusted with the briefest of mentions.

After taking Babylon, Cyrus the Great proclaimed himself "king of Babylon, king of Sumer and Akkad, king of the four corners of the world" in the famous Cyrus Cylinder, an inscription deposited in the foundations of the Esagila temple dedicated to the chief Babylonian god, Marduk. The text of the cylinder denounces Nabonidus as impious and portrays the victorious Cyrus pleasing the god Marduk. It describes how Cyrus had improved the lives of the citizens of Babylonia, repatriated displaced peoples, and restored temples and cult sanctuaries. Although some have asserted that the cylinder represents a form of human rights charter, historians generally portray it in the context of a long-standing Mesopotamian tradition of new rulers beginning their reigns with declarations of reforms.[71]

TL;DR: All of these teams are fighting in the name of the same, sick, blood god.