> So you don't know anything for sure, yet you know that "Neither do I."

I did not say that. Reread:

> Knowing that we do not know anything for sure besides that we do not know anything for sure is the only thing we know for sure. This is the only conclusion that needs to pressupose nothing, not even logic itself, since if logic is not there, we cannot know anything either.

As you see, I know one thing for sure. (I know, I'd have to expand that sentence infiniteley, which for practical reasons I won't. Language can't really put this concept properly, I guess.)

> I think that if you don't know anything for sure, you should live consistenly with your beliefs and stop making knowledge claims.

As you very well know, there is a difference between scientific knowledge, which is gained by observation and validated by testing, and philosophical knowledge, which does not exist.

> Indeed the only way ANYONE can know ANYTHING for sure is through divine revelation by an omniscient being, exactly what Christians claim.

So, they claim that they know truth, and everyone else is wrong because they say that their god said so? That's laughable and does not show anything.