That’s really stupid, atheists believe that belief in God is man’s biggest problem,
I'll give you one counter-example to that: me. I believe that there are much worse problems for mankind than belief in a fictional entity. It's like saying that the belief in Santa Clause is the biggest problems that our children are facing today.
you know, all wars are fought in the name of God and what not;
Not true either, and no I don't believe this. Most wars are fought in the name of much stupider things than said fictional entity.
so an atheist would likely let the injured be and move onto another.
Say what? This doesn't follow from your initial point. Why would an atheist, even one who believes that belief in God is the worst thing facing humanity today, do what you just described. This makes NO SENSE!
I guarantee that if a voodoo practicing Haitian were injured and a Christian were helping him, he’d be very glad, and he would know that a Christin would not accede to the wish of invoking demons... while the atheist, in his ignorance, would accede and allow for demonic intervention.
No, an atheist wouldn't ask for demonic intervention: we don't believe in demons either. Then again, I'm not sure I understand your point here, so I'll let that slide. Oh and what's a "Christin"?
If the atheist wishes to know whether or not demons exist, stay and live among those who practice voodoo or other paganistc practices, and challenge them to a, shall we say, contest.
I don't understand your point here either. I get what you're saying about the atheist living among pagan/voodoo/etc. peoples, but what's this about a contest? A contest between the atheist an the pagan? A contest between a christian and the pagan? We don't need anything like that to know that demons don't exist. We're fairly sure demons don't exist because we've never seen or heard any credible evidence for a demon. Or for God.