If Interplayer is unsaved which he would be if he rejects the trinity then no matter how much pride, he can't answer theological truth because he can't discern theological truth.
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Nope.
If the lost were unable to discern (understand) the Scripture, that they might then believe the Scripture: no one would get saved.
Romans 10:13 For whosoever shall call upon the name of the Lord shall be saved. 10:14 How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher? 10:15 And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things! 10:16 But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report? 10:17 So then faith cometh by hearing, and hearing by the word of God. 10:18 But I say, Have they not heard? Yes verily, their sound went into all the earth, and their words unto the ends of the world. 10:19 But I say, Did not Israel know? First Moses saith, I will provoke you to jealousy by them that are no people, and by a foolish nation I will anger you. 10:20 But Esaias is very bold, and saith, I was found of them that sought me not; I was made manifest unto them that asked not after me. 10:21 But to Israel he saith, All day long I have stretched forth my hands unto a disobedient and gainsaying people.
In refusing to believe what had so often been expounded unto them; Israel had blinded themselves to it; by it.
As a result; when the Lord finally showed up within their midst; Isaiah's lament and resulting prediction concerning Israel's stubborn unbelief in his day; was found still the case in the same stubborn practice of many, in Christ's day...
John 5:43 I am come in my Father's name, and ye receive me not: if another shall come in his own name, him ye will receive. 5:44 How can ye believe, which receive honour one of another, and seek not the honour that cometh from God only? 5:45 Do not think that I will accuse you to the Father: there is one that accuseth you, even Moses, in whom ye trust. 5:46 For had ye believed Moses, ye would have believed me: for he wrote of me. 5:47 But if ye believe not his writings, how shall ye believe my words?
They were reading Moses, but refusing to actually believe Moses.
The result?
"Thy Word" - which had been meant to be "a lamp unto my feet and a light unto my path" (Psalms 119:105) ended up a vail over their heart, due to their own refusal to believe said Word.
Fact is, that the lost remain lost for the same reason the saved can often remain confused and or ignorant on one thing or another - either's refusal to hear a thing out, when it is expounded unto them "because it just does not fit where" such an individual has come to to "look at things from."
And where such an individual tends to turn hostile when an error is pointed out them.
The various inner civil wars within MAD over the decades have been based on those two aspects - and still are...
Lasting and or later falsehoods within the various schools of theology: including within the various schools of Dispensationalism, are the result of both those kinds of issues.