As one who has also evidenced unbelief in the Bible and scorn of the God of it, your input is not surprising. However, as regards the efficacy of objections to Bible versions, what negates their argument is that absolutely none of the Biblical mss, including those which antedate the Qur'an, concur with the Islamic contradictions of it.
In addition, the theory that the Bible was changed, so as to make Jesus the Son of God who died for our sins and rose again, would not simply require a few changes but almost a complete rewritting of the NT and substantial changes to the old.
Moreover, if the Catholic church was responsible for these then it was very neglectful when and if it had such power to make even small and easy changes that would give clear support for many of its teachings (calling elders "priests," praying to the departed, etc.)
The same objections raised even by Jews.
http://www.freerepublic.com/focus/f-religion/2917768/posts
Look up Blasater1960’s posts.