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I believe all of us who love God and are Christian ought to follow Paul's example at Athens (Acts 17) when obeying the Great Commission whether ministering to those who believe nothing or like Apollos, believed in part or in error (Acts 18).

You wouldn't by any chance be speaking of the same Paul who also said:

9) But avoid foolish questins, and genealogies, and contentions, and strivings about the law; for they are unprofitable and vain.
10) A man that is an heretick after the first and second admonition reject;
11) Knowing that he that is such is subverted, and sinneth, being condemned of himself.
Titus 3:9-11 KJV

At Athens, Paul addressed the Greeks in their own terms, understanding what they believed and reasoning with them.

Would that be the same Paul who alsosaid:

And I, bretheren, when I came to you, came not with excellency of speech, or of wisdom, declaring unto you the testimony of God.
2) For I determined not to know anything among you, save Jesus Christ, and him crucified.
3) And I was with you in weakness and in fear, and in much trembling.
4) And my speech and my preaching was not with enticing words of man's wisdom, but in demonstration of the Spirit and of power:
I Corinthians 2:1-3 KJV

You mean that Paul?

Thank you for your reply and the passages!

You mean that Paul?

Indeed. I mean that very same Paul, who tailored his speech according to his audience.

I have fed you with milk, and not with meat: for hitherto ye were not able [to bear it], neither yet now are ye able.

For ye are yet carnal: for whereas [there is] among you envying, and strife, and divisions, are ye not carnal, and walk as men? For while one saith, I am of Paul; and another, I [am] of Apollos; are ye not carnal?

Who then is Paul, and who [is] Apollos, but ministers by whom ye believed, even as the Lord gave to every man? - 1 Corinthians 3:2-5