we have a record of Noah offering animals after the flood ((Genesis 8:20)). this intuitively seems to be a thanksgiving/peace type of offering, not a guilt offering - he's effectively doing this in reply to the grace God has shown him & his family in saving them. it is significant that this is an offering containing blood, and that Noah knows what is a 'clean' animal ((most likely in terms of sacrifice, not food - for Noah isn't given animals for food at all until Genesis 9:3, after he's made oblation)). on the other hand, Noah had been on the ark for a year -- he didn't have 'firstfruits' of any kind of grain available to him by this time, tho it's plausible that he may have had firstborn animals. in either case, Noah had personal access to livestock to sacrifice, belonging to him, so he's not in the same situation as Cain who we may presume did not have animals *of his own* to present. so i think Noah's offering is inconclusive as far as it speaks to whether a bloodless offering would have been acceptable.
there is also this, which may be an oblique record of sacrifice:
To Seth, to him also a son was born; and he called his name Enosh.
Then men began to call upon the name of the LORD.
(Genesis 4:26)
this is an hard verse to understand -- what does it mean that then men began to call on the name of the LORD?
Cain & Abel weren't doing this? probably a question worth it's own thread
Again, I appreciate the fact that you are really digging into this topic. Thanks.
You are really giving this some serious thought while others are satisfied to give us the party line.
Very interesting points.
Add this to what I was saying earlier about Moses writing in Gen.2 about the seventh day.
It is written after the law had been given to Israel through him. It makes me wonder if Noah had some understanding of the law, or if he was just being obedient to God, not knowing the full implications of what he was doing. Then when Moses wrote about it he described it in terms that helped the Israelites reading/hearing the text to how it applied to them. (more than to Noah)
The Gen.4 reference you provided makes me wonder if God was becoming more and more distant and humankind became more and more wicked. Approaching the days of the flood. Earlier in the chapter, God was right there to talk to Cain. By verse 26 men are having to call on his name. And as you asked, what does it mean? Were they invoking the name, or praying, or calling out for God to come and speak with them?