Where the letters YHWH appear in Hebrew scriptures we find the words "LORD God" in our English translations of the Bible. Despite translations the letters YHWH do not mean "Lord" or "God," it is the specific formal name of a specific god, the god of Abraham. YHWH in English it is pronounced Yahweh, that is the name of god of the Bible. Again, the name of the god of Abraham is "Yahweh". "God" is what Yahweh is, not who he is. Because of the removal of the lord's name most Christians do not even know the name of the god they worship.

Lost in translation Why Yahweh's name was removed? It was believed that one should not verbally speak the name of the Israelites' god so when reading his name the Hebrews would say "Adonai" ("Lord") instead of Yahweh. This tradition was carried over into the Greek translation of Hebrew Scriptures (The Septuagint) where YHWH was translated to the Greek word for Lord, "Kurios". This was further carried into modern times where English Bibles now commonly translate YHWH to LORD in all capitals.

God dammit The ever popular third commandment "Thou shalt not take the name of the Lord thy God in vain" actually says to not take the name of Yahweh your god in vain. As previously mentioned the ancient Hebrews felt that one should not say the name of their god aloud, this is what was meant by not taking their god's name in vain. Saying "God dammit" is NOT an example of taking his name in vain because his name is NOT God. One would only be breaking the third commandment if they said "Yahweh dammit."

Certain clues have led biblical scholars to reinterpret the Exodus story to include the Shasu people, who lived in the deserts of southern Canaan from around 1500 BCE until 1100 BCE. Egyptian texts place the Shasu people in a place called YHW around 1375 BCE. The name YHW, which may also refer to the Shasu's patron god, bears a striking similarity to the name of the Israelite god, YHWH. Another clue is that, according to the Bible, Moses encounters the burning bush in the region of Midian (Exodus 3:1), which also lies in southern Canaan. Some scholars believe a band of refugee slaves from Egypt passed through Midian, including a place called YHW, and adopted the Shasu god as their divine deliverer.

How could a god be married to another god if there is only one god? Well much like Christianity and every other religion, Judaism evolved over time into its current state from piecing together old ideas with new ideas. The early Israelites were not monotheist like those who eventually wrote the scriptures we know but rather polytheists who believed in many gods. Modern archeological findings confirm this, an excavation at Tel Rehov unearthed thousands of pagan idols throughout Israel dating from the 10th to 6th century BCE. As it turns out most Israelites did not adhere strictly to the official state concept of monotheism.		Asherah is a Mother Goddess who was the wife of El, the head deity of Canaanite mythology. In the earlier stages of what is now Judaism Asherah was believed to be the wife of YHWH, the head deity of Israelite mythology. In the 1970s, Israeli archeologists digging in Kuntillet Ajrud in the Sinai found a little desert fort containing the Hebrew inscriptions "Yahweh and Asherah" all over the place. In 1968 archeologist William Dever discovered an inscription in a cemetery at the site of Khirbet el-Qôm, a Hebrew inscription of the 8th century BCE. It gives the name of the deceased, and it says "blessed may he be by Yahweh and his Asherah." It is clear from these findings that early Israelites during Abraham's time believed in multiple gods. Good thing the Israelites changed the story about Yahweh having a wife before later storytellers had him impregnating a young woman named Marry.
Sources include http://www.pbs.org/wgbh/nova/bible