The reasons why I am not Christian are many. In my personal experience most religions have similarities that lie in common sense. In studying the Bhagavad Gita, and other Hindu Scriptures I resonated towards their more universal expression of Divinity as not only light, but darkness also.
I also don't like blaming all the negativity of the world on a curse that happened due to one man (and woman) making a mistake back some several thousand years ago. I also don't like blaming some "evil entity" like the devil for mistakes that humans make.
I tend to follow the Buddha's teaching in that we each have a responsibility towards how we treat each other. Through my own personal experience I have found Buddha's "middle path" to be more beneficial to my psychological and logical well being, whereas Christianity sent me into a few years of personal inner conflict due to the fact that I am Gay.
What I also do not agree with is that YHWH tried constantly to "fix" humanity. Through the flood, and through Christ. Both times however the "Unconditional Love" that many people put across as YHWH having, seems conditional to me.
In my personal comparison, the figure of YHWH as a Creator, an All-Seeing, All-Knowing, All-Powerful Creator seems illogical, because so many of His qualities are so... human. So unbelievably ego-centric and jealous. I could almost use the word petty here as well. Though I don't wish to offend anyone.
But out of all the characteristics of deities, out of all the scriptures I have read from religions all over the world, I feel that the characteristics of YHWH/Jehovah are very two dimensional. This is my personal experience and I apologise if I have offended anyone, I am just stating what I have discovered for myself.