I tend to see fruitless debate as two sides that want to be heard but refuse to listen, rooted around persuasion. Man can justify and rationalize anything within his own mind.
Tit.3:10 A man that is an heretick after the first and second admonition reject;
I suggest we not entertain fruitless debates but rather study to show ourselves approved!
2 Jn.1:10-11 If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed: For he that biddeth him God speed is partaker of his evil deeds.
(Don't enable or support such/ guilt by association)
2 Tim.2:16 But shun profane and vain babblings: for they will increase unto more ungodliness.
2 Tim.2:23 But foolish and unlearned questions avoid, knowing that they do gender strifes.
Prov.17:14 The beginning of strife is as when one letteth out water: therefore leave off contention, before it be meddled with.
("contention"- reeb- a contest (personal or legal): - + adversary, cause, chiding, contend (-tion), controversy, multitude [from the margin], pleading, strife, strive (-ing), suit.
/1 Tim.6:4/ Jas.3:14-16/ Gal.5:19-21/ 1 Cor.3:3/ 2 Cor.12:19-20/ Prov.26:20/
Phi.2:3 Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves ("vainglory" - kenodoxia- empty glorying, that is, self conceit: - vain-glory.)
(suggested blogs- Spiritual discernment, showing Love, Rebuke)
Col.4:6 Let your conversation be always full of grace, seasoned with salt, so that you may know how to answer everyone.
We are also warned against overloading others when it comes to ministry Lk.6:29.
* Remember fishers of men look for interest. The sinners Christ had company with were interested in The WORD. We are Not called to fellowship with nor entertain those who mock God's WORD, so often times separation is an option before rebuke (thus we are given the gift of spiritual discernment).
One sent of God (instruments of The Judge /Elohim) is concerned for all, and they give glory to YHVH. You can sow a seed as an instrument of God but God gives the increase. Judgement is according to The LORD and his will. We are not called to judge by our own accord as to say one is hopeless of salvation (Matt.5:22), our job is the opposite. Spiritual Isreal is called to bring forth God's WORD to the nations and to serve as an example of how to have a relationship with The LORD. (Today this calls for us to stress the importance of Repentance and embraceing a ongoing relationship with The LORD according to his will- By Grace through Faith)
Jn.6:44 No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day.