Your second point misrepresents the common atheist position - namely that there is probably no God, in much the same way that I believe there is probablyno China teapot (http://en.wikipedia.org/wiki/Russell%27s_teapot) sitting in orbit between Earth and Mars. It's not an absolute faith, because atheists (claim to be) willing to revise their position on either issue should there be material evidence to the contrary of their beliefs.
Some variants of agnosticism (including my personal beliefs), on the other hand, do require faith: faith that issue of whether or not there is a God or other supernatural / spiritual realm beyond the physical universe is necessarily unknowable.
Re: Codicil B
Some variants of agnosticism (including my personal beliefs), on the other hand, do require faith: faith that issue of whether or not there is a God or other supernatural / spiritual realm beyond the physical universe is necessarily unknowable.