Titus 3:9 but avoid foolish questions, and genealogies, and contentions, and strivings about the law. For they are unprofitable and vain.
Titus 3:10 A man that is a heretic, after the first and second admonition, avoid:
Titus 3:11 Knowing that he, that is such an one, is subverted, and sinneth, being condemned by his own judgment.
Those who continue to deny the deity of Christ can fool themselves however they like, but they should get used to the idea of hearing, "I never knew you" from the very Jesus Christ they deny is God.
1 Corinthians 2:13 Which things also we speak, not in the words which man's wisdom teacheth, but which the Holy Ghost teacheth; comparing spiritual things with spiritual.
14 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
15 But he that is spiritual judgeth all things, yet he himself is judged of no man.
16 For who hath known the mind of the Lord, that he may instruct him? but we have the mind of Christ.
Acts 15:8 And God, who knows the heart, bore witness by granting them the holy Spirit just as he did us. 9 He made no distinction between us and them, for by faith he purified their hearts.
John 14:17 Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.