The prodigal son does include ideas of redemption, but notice there is no Jesus character in the parable at all. How could it be about salvation as you see it?
Ideas? Jesus talked to the crowds about ideas? He lectured and taught the crowds with ideas? I presume that you mean ideas unconnected with His other teachings.
Odd, isn’t it?
On the other hand, if you would consider that Jesus actually meant something important by it (I guess that we Catholics often mistake the Words of Jesus to be of utmost importance, by Reformed standards anyway) then we need to take it into account when trying to believe in Christ’s teachings.
All I was saying is that the story of the prodigal son was not designed to give a full picture of salvation.