Why do Sola scriptura Protestants believe in the Trinity?
Disclaimer: the following questions (as well as the title of this thread) is not original to me, but none the less I personally found these questions of interest in understanding how modern western Protestants and modern Western Evangelicals use and apply Sola Scriptura. I think the answers to these questions may be of interested in understanding how Sola Scriptura Protestant who embrace the trinity converse with Sola Scripture Protestants who do not embrace the Trinity.
Where in the bible is the doctrine of the Trinity mentioned? Where is it explicitly defined? Where does it say that there are 3 persons in 1 God? What about Hypostatic union? Is that doctrine in the scriptures?
Just a question out of curiosity. Why do Protestant sects who adhere to Sola-Scriptura--that is, Bible Only, believe in the doctrine of the Trinity? The Trinity was developed by the Church and is never explicitly explained in the Bible. Sure, it may have been briefly implied in certain instances, but there are not any smoking-gun proof passages in the Bible that support the Trinity as far as I know. Most of the purely Biblical arguments in support of the Trinity seem rather unconvincing and built more on speculation than the actual Bible to be honest. I don't see how you can believe these arguments and believe in the Trinity UNLESS you accepted the authority of the Church and extra-biblical sources--something that most Protestant sects refuse to do.