Hi reniaa...
Do you mean 'Genetic Memory'? That's purely hypothetical. Flood stories show many points of commonality because regardless of location, the experience is going to be similar. Like two people going to the same theme park years apart are still going to dscribe similar experiences. Therefore, many flood stories do not validate your particular favorite version or prove there was ONE great global flood. What basis do we have to belive yours over the Babylonian? Sumerian? Aboriginal? Chinese? Egyptian? I'll tell you: NONE. In fact the DIFFERENCES in the flood stories far outnumber the similarities, which would therefore count against the idea of common origin. The only reliable FACT that can pulled from the stories, is that floods have been a common occurance throughout mans history.
Now you're confusing a prevelant CONCEPT with a 'racial memory'. You're beginning with the assumption that there is a God and working circularly. There is no evidence to indicate that mans inclination towards belief in the supernatural is anything resembling a 'memory'.
There are three possibilities regarding the so called 'racial memory' of some form of a 'God':
1) They are all correct, all of those gods exist in some form or another.
2) Only one [or a few] is correct. The rest are distortions, or some other kind of error. [As you claim]
3) All are wrong.
You seem to be discounting the third possibility, and since there is no evidence of any supernatural occurence... ever, it seems to be the most reasonable.
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EDIT: I can't believe I just typed that whole thing with out realizing you completely dodged the question. Ah well...