On a scale of 1 to 7, with 1 being absolute certainty that there is a god, and 7 being absolute certainty that there is no god, even Richard Dawkins claims a 6. Why? Because he's a scientist, and unlike religious folks, any good scientist will never say anything is absolutely true or absolutely untrue. We live in the realm of probabilities. And to me, the probability that there is no soul is pretty high. Not 100%. But pretty high.
As for your perception of living in only one body, I'm not really sure where you're going with that.