Concerning spiritual mentorship. Whoever is your teacher and senior that you adhere to, this defines what you profess. That is why Paul, an apostle of Jesus Christ made it emphatic when he said:

1Tm:1:
1 ¶ Paul, an apostle of Jesus Christ, according to the commandment of God our Saviour and Christ Jesus our hope:
2 To Timothy, his beloved son in faith. Grace, mercy and peace, from God the Father and from Christ Jesus our Lord.

2Tm:1:
1 ¶ Paul, an apostle of Jesus Christ, by the will of God, according to the promise of life which is in Christ Jesus:
2 To Timothy, my dearly beloved son. Grace, mercy and peace, from God the Father and from Christ Jesus our Lord.
3 I give thanks to God, whom I serve from my forefathers, with a pure conscience, that without ceasing I have a remembrance of thee in my prayers, night and day.

Ti:1:
1 ¶ Paul, a servant of God and an apostle of Jesus Christ, according to the faith of the elect of God and the acknowledging of the truth, which is according to godliness:
2 Unto the hope of life everlasting, which God, who lieth not, hath promised before the times of the world:
3 But hath in due times manifested his word in preaching, which is committed to me according to the commandment of God our Saviour:
4 To Titus, my beloved son according to the common faith, grace and peace, from God the Father and from Christ Jesus our Saviour.

Paul the apostle also warned:

Gal:1:
6 ¶ I wonder that you are so soon removed from him that called you into the grace of Christ, unto another gospel.
7 Which is not another: only there are some that trouble you and would pervert the gospel of Christ.
8 But though we, or an angel from heaven, preach a gospel to you besides that which we have preached to you, let him be anathema.
9 As we said before, so now I say again: If any one preach to you a gospel, besides that which you have received, let him be anathema.
10 ¶ For do I now persuade men, or God? Or do I seek to please men? If I yet pleased men, I should not be the servant of Christ.

2Cor:6:
14 Bear not the yoke with unbelievers. For what participation hath justice with injustice? Or what fellowship hath light with darkness?
15 And what concord hath Christ with Belial? Or what part hath the faithful with the unbeliever?
16 And what agreement hath the temple of God with idols? For you are the temple of the living God: as God saith: I will dwell in them and walk among them. And I will be their God: and they shall be my people.
17 Wherefore: Go out from among them and be ye separate, saith the Lord, and touch not the unclean thing:
18 And I will receive you. And will be a Father to you: and you shall be my sons and daughters, saith the Lord Almighty.

Ps. 118:1 Give praise to the Lord, for he is good: for his mercy endureth for ever.