Some things, like "Trinity" and "Ever Virgin," are not written on the face of scripture, but understood from the earliest Christians as part of the deposit of Faith, which comes from Scripture AND Tradition, as Scripture attests.
Some things simply are anti-scriptural, like the whole Sola Scriptura straw man you are arguing from.
“Trinity”, “Sola Scriptura” and, to a lesser degree, “ever virgin” are mere labels. Sometimes their meaning is clearly sufficient enough for the phrase to fairly completely “mean what it says”. Ever virgin does that. It means, basically, that the person to which it is applied never had sex in their entire life. The other two are deep with subtle meaning and, on their own, don’t mean much unless used in the company of like minded people on the subject. That is, the word “Trinity” is used by one group to mean one thing while used by another to mean something similar, but different.
I will say this: I’ll take the bible as gospel before I will believe any man, simply due to his title. It is not only my right, but as a Christian it is also my responsibility. But I do understand that this is not the Catholic way. They believe, like the Mormons, that their leaders are placed by God and to be honored and believed accordingly. I think Islam does that too, come to think of it. As for me, I believe the believers are the “Church” and gather together in His name. It is, like the apostles, a loosely formed organization. It brings its own problems, e,g, Judas, but the rewards are greater.