Can the Church Give an Authoritative Decision on Certain Moral Practices?

In general, churches can and do offer authoritative rulings on moral issues. For example, many churches will say that if you are pro-choice, you may not be a member of that church. That's a real authority. Would God punish a Christian who left a church because he wanted to engage in these acts like IVF or gay couples or contraception or abortion? Because the reason was these acts are not condemned in scripture.