Carl,
1.Editors think in terms of pages and layout and so you could put the quotes on the cover page (and save a page) or on the following page (often called the “gateâ€ page). Either way is fine.
2.The text does build an argument for Agnosticism in a non-antagonistic way, which is crucial to convincing readers (many of whom will, at the mere mention of the term Agnosticism, revolt against and reject your text.
3.The meaning of Agnosticism is clear and the important point, in my opinion, is that the readers do not assume Agnosticism is the same as Atheism (though many readers will likely have this mis-assumption already in their minds).
4.Doesn’t this echo a child’s prayer? For some reason, this reminds me of a song. If you choose to go this way, others may think as I do, which trivializes your point. The simple statement that “the Bible ultimately leads to that conclusionâ€ sets down a claim that you’ll then have to support in subsequent text. 

As for the “meâ€ issue, academic writing discourages its usage, though I think we would all benefit if authors did indeed use “me.â€ Then the counterargument could be against both the paper’s basic argument and the author’s character as well. For example, if Tiger Woods wrote an article on celibacy, it should be fair to question his personal credibility  on this subject. 

Would not go with your final suggestion as it beats the drum a bit too much about Agnosticism. Your position on this matter was made clear much earlier in the text, and so don’t have a weak finish. The first thing that readers remember is the last thing that you wrote.

Jackson