To use your own argument: are all these atheists running around killing everyone? Athiests don't all have the same coda and especially not that about killing people or being mean to religious types; yet religion breeds - inherently - the contempt of other explanatory systems. As an atheist, I can take or leave religion as I choose without any need to convert anyone or oppress anyone for not converting.
How about any theist who goes around killing is actually an atheist, he/she obviously has no scruples, which means he/she does not believe in accounatbility? *thums nose*
No - you show me by detecting an altruistic gene that isn't related to kin-preference or selection. Show me the magic.
I maintain that no evidence exists indicating a genetic basis for moral behaviour. *shows tongue*
And so far, there is no demonstrated requirement for a god to be either responsible for cosmological or evolutionary phenomena; your appeal to falsifiability is a subtle plea to unknowningness - that we cannot demonstrate "no-God", so that there must be one, who does and makes all things. This is silly - we can demonstrate no necessity for a god, and Ockham's Razor then dictates we take the simplest explanation. We might as easily posulate that leprechauns or unicorns exist, because we have no evidence to the contrary; but rather, it is the lack of evidence for their existence that makes us reject the concept.
In that case I reject your rejection as Occam himself indicated that God and belief do not fall under his razor.
I'm still waiting on a response to number four.