Norseman

God says be fruitful and multiply to Adam and Eve. God says sex before marriage is sin. In order to be fruitful and multiply, they would need to be married. Since when were there priests in Eden to marry Adam and Eve? Could they simply have been not fruitful and not multiplied, or was that a sin too for not doing as they were told? Any quotes, any help?

Sauron

God presented Eve to Adam, to be his "helpmate". And then told them to go forth and multiply. That was the wedding. God acted as his own priest.

Not that I believe the story, but you aren't going to get any traction by trying to base an objection in the reasoning you've presented here.