The Apostles Creed is this,
I believe in God, the Father Almighty,
the Maker of heaven and earth,
and in Jesus Christ, His only Son, our Lord:
Who was conceived by the Holy Ghost,
born of the virgin Mary,
suffered under Pontius Pilate,
was crucified, dead, and buried;
He descended into hell.
The third day He arose again from the dead;
He ascended into heaven,
and sitteth on the right hand of God the Father Almighty;
from thence he shall come to judge the quick and the dead.
I believe in the Holy Ghost;
the holy catholic church;
the communion of saints;
the forgiveness of sins;
the resurrection of the body;
and the life everlasting.
This creed has long been the very basics to claim orthodoxy. If we were ecumenical in this, and made this our basis for communion, we could really claim to believe in "the holy catholic church." As it stands, each of us, and especially institutionalized bodies, add to this creed their own bits. And then they make the claim that these additions are essential to the whole matter, and their understanding is the one true understanding which is "biblical" and authoritative. And in doing so, they're already disposed of the belief in the "holy catholic church."
It may be anything here. I'll just provide a few examples from my own personal experience.
- The bible is inerrant and infallible
- Biologic evolution is incompatible with faith
- Marxist economic theory is contrary to Scripture
- American Conservative political ideology is godly (I've literally heard someone say, "I'm not a Democrat, I'm a Christian.")
- Women must not have authority over a man in any way
- "Big bang" cosmology is demonic
- The Trinity is hierarchal
- God must not be addressed with a feminine name or virtues
- You must receive the gift of tongues
- Baptism is fully submerged, and never of a child