As you correctly point out, “Trinity” is not found in the Bible, but scripture points exactly to a Triune God.
“Rapture” also is not found in the Bible, but unlike “Trinity”, the scriptures when taken in full context dispute this teaching completely.
“In context” is the underlying truth here.
God Bless
Sorry, but no they don’t dispute it completely. I don’t hold to a “Secret Rapture” doctrine, the Rapture will be anything but secret but it is also very evident from Scripture that the Church will be spared from the Wrath that falls during the Time of Jacob’s Trouble.
Now I do not wish to speak for you in this matter, so I will ask for you to clairify how you reconcile the fact that the Church is not appointed to Wrath, yet at the very least the second half of the Tribulation is the Wrath of God poured out on an unrepentant world who knowingly rejected Christ.
This is, I believe, a major disconnect and I would like to see how you reconcile it.