Correct me if I'm wrong, but it seems like you are saying 'The Bible is the book most agreeable to me, so I will follow its teachings.' Is that a wise thing to do? I don't know your position on religion, but a great many things which were touted in the Bible as factual are now seen to be false. Does that not phase your opinion of the book? How good of an Oracle is the Bible, if when scrutinized, gives false answers?
On the basis of your second point - mainly that newer writings of Islam, Mormonism etc. were founded on the percieved deficiency with Christianity, I have another question. If the pattern is that newer writings are unecessary additions to an already complete Life Manual, then where does that leave Jesus and the New Testament? The Old Testament writings were completed at least 2 centuries before Jesus appeared. Surely by that logic, Judaism is the way to go? Why do you draw the line at Christianity and say 'everything behind this line is true, and everything past it is false'? And what of the myths included in Islam and Mormonism - how are they different from the Bibles myths of 6 day creation, the Flood, the tower of Babel, the Exodus and the Messianic Lineage?
I'm interested in your answers, get back to me when you've finished your work.