I am always weary of anyone who claims to KNOW what the Bible is saying over any particular issue. When people or groups claim ultimate biblical knowledge and understanding I am always troubled. How can we ever truly KNOW what Scripture is saying? We can BELIEVE what Scripture is saying and have a level of confidence in that interpretation, but ultimate knowledge can never be assumed. Here's a good analogy:
'I took a cat to Holland'.
Now if I wrote that in a letter, what would I mean? It can be interpreted in a variety of ways.
1. I took a feline to the Netherlands
2. I took a catamaran to the Netherlands
3. I took a Jaguar car to Holland-On-Sea
4. I took a catalytic converter to Holland
...and I'm sure the list could continue.
The thing with Scripture is that none of us can be sure of each authors primary meaning and context. We can make very educated guesses, but absolute certainty can never be ours.
That is why Scripture as a blueprint can never be helpful or even attainable. Scripture is there to reveal to us something of who God is and guide and lead us in our ethics and practice in the world we live in today.