In Romans 5 we are plainly told in verse 19 it is through one man by birth...I would support it a bit more ...but its is a simple answer it would seem compaired to other questions I have seen on here so far.
@TRiG The song was fun. The lyrics were quite clever. I think I've seen this guy before, but not much of him. The first part of his song was very Elton John.
@fredsbend I think it is just suspicion on the part of group 1 that if circumstances were different, members of group 2 would merrily go off to club baby seals. Like any other absolutists-vs-pragmatists thing, where we agree on most stuff and are on the same side, so we have to argue about tactics and philosophy and hypotheticals instead.