Why are you (still) a Christian?

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No. I'm talking about the Jews who wrote the Bible. And the beliefs of the Jews in the Bible.

I don't think you were. You were talking about Judaism, Jewish tradition that began to deviate from the Hebrew scriptures after Alexander III of Macedon in 332 BCE. The Jewish leaders of Jesus' day, who were able to assume the coveted Aaronic priesthood in 70 CE after the destruction of the temple of Jerusalem.

The story above is IN the Bible. It's in Kings, just like I said. 

The story was, but not your interpretation.

The Jews (who wrote the Bible), .. including the story above, thought the "Heavenly Host" was comprised of many divine beings, but they were not gods.

Divine means god, deity, or something like it. It can be used in the same sense as holy or sacred, which basically means "belonging to." The Hebrew el and it's variations (elohim, etc.) mean god or gods coming from a root word which means strong. Anything and anyone can be a god/goddess. So, the Bible, Hebrew/Greek scriptures refer to mortal men, inanimate objects and spirit beings (angel, for example, meaning messenger) as gods. Divine. The heavenly host are angels, seraphs, cherubs. Jehovah God's army.
  

You're also wrong about the shade of Samuel. Shades were not deceptive or demonic.

 

According to Jewish tradition? Perhaps, but not according to the Bible. So in the story of the witch of Endor, Saul had gone nuts, Jehovah and Samuel had rejected him. Samuel, before he died, had refused to talk to Saul. Spiritism, including being a witch or spirit medium was a capital offense. Against the Law of Moses. Shade refers to shadow. The spirit of the dead in pagan mythology. Greek underworld, for example, the Egyptian book of the dead. In the Bible the word spirit (Hebrew ruach/Greek pneuma) means an invisible active force producing results. The English pneumatic and pneumonia, for example. Wind (Exodus 10:3), breath (Habakkuk 2:19), compelled mental inclination (mean spirited) God's holy spirit (active force) or spirit beings. When we die, according to the Bible, the spirit (breath, spark of life) departs us. We are dead. Just worm food. There is no spirit or soul (breather, life). No consciousness in sheol. (Ecclesiastes 9:4-6, 10)

Witches, fortune telling, spirit mediums were all forbidden because they were deceptive - influence of demons. Spiritism (Greek pharmakia), the use of drugs primitive pagan people used to gain access to the spirit world. So, the traditional Jewish interpretation of the account of Saul at Endor doesn't make sense. Why would Samuel council Saul after Jehovah and Samuel himself had rejected him, especially through employing a forbidden practice with demonic influence.

"The concept of a divine assembly (or council) is attested in the archaic Sumerian, Akkadian, Old Babylonian, Ancient Egyptian, Babylonian, Canaanite, Israelite, Celtic, Ancient Greek and Ancient Roman and Nordic pantheons. Ancient Egyptian literature reveals the existence of a "synod of the gods".

Okay.