Should anyone question the decision, it is not unheard of for a Christian to claim it is a matter the Scripture does not cover or address. But is that accurate?
In II Peter 1, versus 2-3, we see a passage which seems to counter-act the idea that we can find ourselves in a situation where the true path to serving God might not be answered in the Bible.
Specifically, the passage says that the divine power of God has granted us everything pertaining to life and Godliness through the true knowledge of Him who called us.
If we therefore claim that God has not left instructions on how to deal with a particular situation, we reveal our own failure, not His. He says we do indeed have the tools we need to discern the correct path.
In fact, if we continue on in the chapter, we see a list of 9 qualities which we can, nay must possess, for if we possess them, verse 10 tells us that if we have these qualities and they are increasing, we are rendered "neither useless nor unfruitful".
It therefore behooves us to study these qualities relentlessly and, more importantly, actively seek to instill them in our lives.
It would seem clear from the passage that faithful study will bring us to knowledge of the principles God would have us live our lives by. If we cannot figure out the path God would have us take in a given situation, it is because we have not studied His word as we ought and have not figured out what moral excellence is, even though the Scriptures have the tools we need.
So study the passage. Study the qualities. Work to instill them in your life. And with the continued study of the Word of God, if you approach it to learn what God would have us do rather than approaching it to prove your own point, you will soon find that answers to what you ought to do are indeed revealed within the Word of God.
Grace and mercy to you all.