Yea I am familiar with Irenaeus. What he taught was not original sin . Augustine does attribute the teaching to him though .A simple reading of the work by Ireaneus “Against Heresies” where Augustine gets his idea shows he taught a form of Pelagianism. Irenaeus taught man had no choice to sin because of his environment and not because of a inherent nature . Irenaeus taught if we had a better upbringing we could be sin free . Augustine taught that a sin nature was inherently inside man before we were born . You are really way off .I don't know if what I read about holy water being mentioned as early as 80 AD is correct since I was not there and niether were you. But what I do know is the Catholics had a grip on the whole Christian world very early on and most of what you believe came from them. For another example we can look at the concept of the original sin that was first alluded to in the second century by Irenaeus, (Bishop of Lyon) who was working for the Catholics and not for the apostle Paul.
Bill