"It is the scripture and the Holy Spirit which determines what is of God."
The Scripture didn't write itself and yes, the Holy Spirit guides the Church through human leadership.
There are many Churches and many denominations and each think they are right and others wrong and all seem to be undergoing changes almost daily.
That each changes it's doctrine and has their on problems is easy to tell by simply reading and watching the news everyday.
Christ warned us that as the time drew near to His return that deception, false teachings,and false doctrines would make their way into our places of worship.
Mat 24:24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
Mat 24:25 Behold, I have told you before.
1Ti 4:1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; 1Ti 4:2 Speaking lies in hypocrisy; having their conscience seared with a hot iron;
The Holy Spirit indwells individuals not organizations.
He has given us His Spirit and His Word and they are our unchangeable benchmarks with which we are to test the things we see and are told.
We as individuals are to test the teachings of any organization, church, priest, pastor,or individual to see if the Word of God and His Spirit, which resides within us [if we are His]supports them.
We will be held accountable for good or bad by what he teaches us not for what these others might or might not teach us.
Gal 1:8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
Gal 1:9 As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.
Gal 1:10 For do I now persuade men, or God? or do I seek to please men? for if I yet pleased men, I should not be the servant of Christ.
Gal 1:11 But I certify you, brethren, that the gospel which was preached of me is not after man.
Gal 1:12 For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ.
God Bless, MRN.