It's not that easy to "convince" people to reject something that they never had any good reason to believe. This way is vain and futile.
Why do you think it can be achieved by arguing obvious biblical incoherence or inconsistency? By arguing ultimately meaningless biblical minutiae that takes for granted his existence anyway?
Honest question.
My honest answer is that many people I personally know that used to be Christian and eventually changed their minds did so only after fully researching the Bible and seeing the inconsistencies within the book.
At some point after reading the bible several times and taking notes, it becomes clear to the reader:
a) the bible was written by several different people and then "compiled" into one book
b) parts of the bible directly contradict other parts
c) if you look at the logic behind the abrahamic god, as written in the bible, it just doesn't make sense
I started off being taught the bible when I was very young; my grandmother would sit down with me and I would read passages with her, go to church, etc.. I saw that the church itself was a place where people tried to represent the best of themselves, and be good to their neighbors, etc.. That being said, I also began to see the cracks in the teachings; the parts that hold back science from progressing, the various factions which would war with one another for small differences.
When I branched out from study of the Bible to other religions, I saw the same behavior - people using religion as a crutch in some cases, or as a reason to discriminate against people of another religious faction in other cases. For example look at the conflict between the shiites and the sunnis, or the Protestants and the Catholics. I went to Europe and looked at the old church paintings in churches that have been around since hundreds of years before America was formed, to see the roots of Christianity in Rome.
I realized that the Bible was being used as a weapon to oppress portions of society that were the types of people that were gullible and able to be taken advantage of, for the privilege of the few. You can teach people to be good, and to behave themselves, without using organized religion as a crutch.