The Apostle’s Creed is one of the oldest and most widely accepted summaries of the Christian faith. Although it was not written by the apostles themselves, it reflects the core teachings of Scripture and has been affirmed by Christians for centuries.
I believe in God, the Father Almighty,
Creator of heaven and earth.
I believe in Jesus Christ, His only Son, our Lord,
who was conceived by the Holy Spirit,
born of the virgin Mary,
suffered under Pontius Pilate,
was crucified, died, and was buried.
He descended to the dead.
On the third day He rose again.
He ascended into heaven,
and is seated at the right hand of the Father.
He will come again to judge the living and the dead.
I believe in the Holy Spirit,
the holy catholic Church,
the communion of saints,
the forgiveness of sins,
the resurrection of the body,
and the life everlasting.
Amen.
In this context, ‘catholic’ means “universal”, referring to all believers in Christ, not the Roman Catholic Church. (For the record, your girl is a Southern Baptist who is comfortable saying the word ‘catholic’ here.)