Don't get me wrong, please, I'm not saying you shouldn't talk about the church model as it exists today being unbiblical, nor if someone is a church building "treasurer" then they're doing something iffy, I mean, if they're doing their job and doing it honestly, then fantastic.
What I'm saying is, if you really are compelled by the Holy Spirit to talk to someone about how denominations are unbiblical, the pastor should be a servant, not an object of worship, or the traditions that a lot of them observe are at best unbiblical and at worst straight up witchcraft, expect a swift and heavy pushback from some. People are scared of many things when it comes to questioning their church building or it's leadership, for some it's questioning if they were ever saved, or if the pastor is doing the right thing, or if they've spent decades wasting their time going there. People hate to think that they might have been lied to by someone they trusted and they'll possibly hate you for even suggesting that concept to them.
This attitude is nothing new though, the Israelites hated the prophets who warned of God's impending judgement on their wickedness, the Pharisees hated Jesus Christ for even suggesting that they were blind and were not of God, and the apostles were persecuted for simply preaching the gospel. In the book of Revelation 10:9 it says:
"And I went unto the angel, and said unto him, Give me the little book. And he said unto me, Take [it,] and eat it up; and it shall make thy belly bitter, but it shall be in thy mouth sweet as honey."
I'm not sure if this is referring to something that was specific to John or not, but I think it's a good metaphor for the bible as well, it's simple and the words are sweet to hear in a lot of cases, but the truth of a lot of it can judge us to the point where we can feel sick to our stomach when it makes us realise where we're falling short. Just as with repentance, not many people will accept it as a failing on their part, after all, even our ancestors, Adam and Eve tried blaming someone else, and we've all done the same at one point or another, I know I have