So I guess then we should stop believing in the Trinity because the word "Trinity" is not in the Bible. All we have are the "wheels" - "Father", "Son", "Holy Spirit", interspersed here and there throughout the NT. The Trinity is so specific and so complicated that to call such "evidence" a Biblical proof of "Trinity" is like insisting that the Bible teaches about Chevrolets merely because we can find the word "wheel" in there somewhere.
But there are more than just wheels in the Bible for Purgatory.
For we must all appear before the judgment seat of Christ, so that each of us may receive what is due us for the things done while in the body, whether good or bad.
2 Corinthians 5:10
Protestants like to say that Christians will only be judged for the good things they have done - in which they will receive rewards. But here Paul wrote that we, which includes himself, will stand before the judgement seat of Christ and receive recompense for what we all did - whether good or bad! If we will be recompensed for the bad we did, then this must mean that we can we receive some punishment for the bad things we still do after we have turned to Christ.
And the whole idea of Purgatory is being phased into Protestant evangelicalism.
Unlike you, I can present evidence of this.
Jerry Walls from the Houston Baptist University wrote a couple of books in favor of it. See
Purgatory for Protestants | Commonweal Magazine.
C.S. Lewis taught that Purgatory exists. See
C.S. Lewis believed in purgatory, for heaven’s sake.
I believe in purgatory. . Our souls demand purgatory, don’t they? Would it not break the heart if God said to us, ‘It is true, my son, that your breath smells and your rags drip with mud and slime, but we are charitable here and no one will upbraid you with these things, nor draw away from you. Enter into the joy’? Should we not reply, ‘With submission, sir, and if there is no objection, I’d rather be cleaned first.’ ‘It may hurt, you know’—‘Even so, sir.
Letters to Malcom - Chiefly On Prayer
Southern Baptist minister Charles Stanley wrote that there is punishment for Christians in the afterlife, although he insists that this is not purgatory:
“Now, imagine standing before God and seeing all you have lived for reduced to ashes. How do you think you would respond? Picture yourself watching saint after saint rewarded for faithfulness and service to the King—and all the time knowing that you had just as many opportunities but did nothing about them. We cannot conceive of the agony and frustration we would feel if we were to undergo such an ordeal; the realization that our unfaithfulness had cost us eternally would be devastating. And so it will be for many believers. Just as those who are found faithful will rejoice, so those who suffer loss will weep. As some are celebrated for their faithfulness, others will gnash their teeth in frustration over their own shortsightedness and greed. We do not know how long this time of rejoicing and sorrow will last. Those whose works are burned will not weep and gnash their teeth for eternity. At some point we know God will comfort those who have suffered loss (see Rev. 21:4) . . . On the other side of the coin, we can rest assured that none of our good deeds will go unnoticed, either.”
Eternal Security
There will temporarily be agony, frustration, and weeping in the afterlife for Christians? This sure sounds like Purgatory, even though Stanley insists it is not. But to me if it quacks like a duck, walks like a duck, and looks like a duck - then it is a duck!
Reformed theologian Michael Horton complained of this tendency in dispensationalist fundamentalism, saying that this is is not much different than Catholic purgatory:
[Protestant fundamentalists] merely managed to move purgatory geographically. No longer is it a place outside of heaven and hell, but it is within the Kingdom of God itself… This has much more in common with medieval dogma than with evangelical Christianity.”
Purgatory in All but Name