All sound is analogue, digital is just a means of storing it really. In order to store an exact replication of an analogue sound, you would need an infinite amount of data. 1's and 0's aren't enough to trace the soundwave with exact precision, it can only get close, but there will still always be jagged edges when examined closely enough. Think of it this way, it's about as possible as having a photograph that you can zoom in down to the sub atomic level without losing any resolution.
When you're listening to vinyl rip it completely defeats the purpose of the vinyl vs cd debate... Because then you have a sound that is converted to digital, which will lose some of the quality due to the nature of digital data, and on top of that the flaws of vinyl would come out like the cracks and pops... so CD is obviously going to be superior once converted to digital since it is meant to be stored digitally unless you really like those cracks and pops.