Tell me:

Those were Church councils.  Why do you accept the authority of the Church to speak on these issues, and accept the creed, and you accept the authority of the Church when it comes to social teaching? 

That same authority also teaches that women cannot be ordained, abortion is murder, gay marriage is sinful, divorce and remarriage is sinful ,etc.  Why on those issues can the Church not be trusted?  Why all of a sudden does the Church not know what she is talking about?

Why should I accept what the Church says about Jesus in her councils if you are telling me I should not accept what the Church teaches about the moral life? If the Church can't be trusted in the moral demands of the Gospel, then it seems to me the Church cannot be trusted on social justice or matters concerning the identity of Christ.