I often hear the argument that we are not to follow a certain set of instructions because these instructions were given to a certain people group at a certain time.

• Which people group were these instructions given to?
• 
  

So, if “sin” is the transgression of the law then shouldn’t Gen 4:7 amongst other passages be proof that a “law” existed before Sinai..

Where is the disconnect?

I guess that would be the belief in the dispensations, disconnecting these things…

But there are so many scriptures in the “new testament” that attempt to reconnect