I'm not quite sure what you want to see when you ask for the 'weakest point in Christianity'. I thought the easily found arguments and frequently discussed arguments were compelling enough by themselves. I was a regular Sunday school attendee, continued to go to church (for social reasons) even after I started to think the whole thing was random, and genuinely enjoy having these sorts of discussions

The main things that I found had weight is that it's taking the numerous world religions and saying 'this one' without any great reason. When the correct selection may damn you for eternity, it's worthy of considering the alternatives.

• From an outside view, I see no reason to privilege the supernatural portions of Christianity over other religions. Rhetorically, what do you find as the weak points of every other religion? Don't many of these apply to Christianity?
• Generic inconsistencies - having read all the Biblical texts (some multiple times), and referencing databases for discussions of the original pre-translated text, the number of straightforward contradictions is outstanding. If we just assume for a second that some of the text was effectively the word of god, you still don't know which parts. And that's disregarding every other religion's text, seemingly without justification.
• Inconsistencies in practice - some branches of Christianity heavily discount the Bible due to the above.... but this makes the problem WORSE. It just dilutes the 'god content' even further. Arguments of your specific practitioners being 'inspired by god' needs to address all the people who disagree with you but say the same thing.

The specific details about Christ, and your 'flavor' of Christianity, are besides the point in light of the above. Other than popularity, Christianity still has the same problems as Zeus and the Church of the Flying Spaghetti Monster.

All that said, the best argument for Christianity seems to be as a placeholder belief and social system. For some people it's better just to pick a set of beliefs and go with it (IE: it's a complex/unknowable local minima problem that's 'good enough').

P.S. - I'd be interested in hearing your arguments 'for' God. I've yet to see one that isn't so broad to be effectively meaningless. You might want to just google your argument for God and see if there aren't already identified issues.