The majority could be wrong

A lie stays a lie even if everyone beliefs it to be true.

You must not follow the crowd in doing wrong. -- Exodus 23:2 (NLT)

And the great dragon was thrown down, that ancient serpent, who is called the devil and Satan, the deceiver of the whole world — whe was thrown down to the earth, and his angels were thrown down with him. -- Revelation 12:9 (ESV)

Church leaders could be wrong

Leaders could be deceiving or be deceived themselves even if they are leading the church.

For when one says, “I follow Paul,” and another, “I follow Apollos,” are you not being merely human? What then is Apollos? What is Paul?

...

So let no one boast in men. -- 1 Corinthians 3:4-5,21

Do not put your trust in princes, nor in a son of man, in whom there is no help. -- Psalm 146:3 (NKJV)

I urge you to study God's word and ask God's Spirit to reveal the truth.