What did Christians do before there was a Bible?
What were they doing?
How did they know what to do, what not to do, how did they know the Old Testament before it was written down?

To dismiss the teachings of the Apostles to the early Church is hurtful to the Lord. For it was He that chose these men to pass along His teachings. The Holy Spirit came upon them so that they would be able to guide people in the ways of the Lord.

Ignoring the Apostles and their teachings (by word or action) is ignoring the gifts and wisdom that the Lord bestowed upon them.

Sola Scriptura is like picking and choosing what you want - instead of receiving all that God has created for you.

Do we not trust in the Holy Spirit?