Augsburg Confession Article VII

A group of high schoolers in our congregation are discussing the articles of the Augsburg Confession, week by week, one article at a time. This week we are on article VII, on the church, which reads:

Also they teach that one holy Church is to continue forever. The Church is the congregation of saints, in which the Gospel is rightly taught and the Sacraments are rightly administered.
And to the true unity of the Church it is enough to agree concerning the doctrine of the Gospel and the administration of the Sacraments. Nor is it necessary that human traditions, that is, rites or ceremonies, instituted by humans, should be everywhere alike. As Paul says: One faith, one Baptism, one God and Father of all, etc. Eph. 4:5-6. 

Here are the questions discussion leaders for this week developed:


1. Are having different denominations against this article or is that what it means by it's not necessary to be alike?

2. Is it necessary to go to church or can one have their own beliefs; would having your own beliefs go against the church?

3. Does it mean the church will remain forever because all a church really is is a gathering of believers where the gospel is taught and sacraments are made?