I do not share the certainty of either Christians or atheists. I admit (with no qualms) to simply not knowing, in common with the whole of mankind. Some believe (either in no god/s or definitely god/s), some admit to the impossibility of knowing.
In many ways that is a bigger challenge, because those of us who are agnostics have no "word" to fall back on, but have to create our morality from a simple sense of love for our fellows. The more of that there is around the better. Sadly organised religions, whilst containing many people of great integrity, sincerity and goodness, do seem to be standing in the way of this. Very sad for all of us.