When is it ok to cause “division” in the church?

So, if you believe like I do that tithing is not a new testament principle and that to impose compulsory tithing is sinful… How do you go about getting your church to address this issue? Do you say to your pastor, “pastor I think we are changing the Gospel and we need to stop?” Do you buy him a book about it or what? Will he just write your opinion off? After all he is the professional Christian. Tell me what you think?