Islam does not espouse the doctrine of original sin.  Islam teaches that the sinner alone, the individual person and not his ancestors or descendants, is responsible for his actions; there is no inherited sin on the soul to be purged as a condition of entry into the faith.  Islam teaches that all good is from Allah and all evil is from man.

Whatever good, (O man!) happens to thee, is from Allah. but whatever evil happens to thee, is from thy (own) soul. and We have sent thee as an apostle to (instruct) mankind. And enough is Allah for a witness. (Q 4:79)