Sola Scriptura is most certainly biblical. And you most certainly can draw out the doctrine of the Trinity using the just the Scriptures.
All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.
The Holy Bible: English Standard Version. (2016). (2 Ti 3:16–17). Wheaton, IL: Crossway Bibles.
And yes, Jesus founded the church which is a pillar and buttress of the truth (1 Tim 3:15). Both are true. But Rome is not that church.
All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.
The Holy Bible: English Standard Version. (2016). (2 Ti 3:16–17). Wheaton, IL: Crossway Bibles.
And yes, Jesus founded the church which is a pillar and buttress of the truth (1 Tim 3:15). Both are true. But Rome is not that church.