Historically speaking, the Reformed churches on the Continent included recitation or singing of the Creed in holy worship, especially in connection with the celebration of the holy Supper (E.g., Zurich, Strassburg, Geneva, and Heidelberg, Netherlands). You can read the liturgies of the first three in that list in Thompson's,
Liturgies of the Western Church. The Form for Holy Communion that was used in Strassburg/Geneva made its way into Heidelberg and then the Dutch Reformed churches through the work of Petrus Dathenus, and can be read in any version of the
Psalter Hymnal that Dutch Reformed churches, such as the URCNA, use.
As far as the Confessions go, Bruce has pointed out the relevant portions of the Westminster Confession. In the Belgic Confession, article 35, on the Lord's Supper, we read:
Lastly, we receive this holy Sacrament in the assembly of the people of God, with humility and reverence, keeping up among us a holy remembrance of the death of Christ our Saviour, with thanksgiving, making there confession of our faith and of the Christian religion.
As I mentioned above, this is confirmed by our practice of reciting the Creed in our liturgy for Holy Communion.
I'll leave the biblical side of things to better lights.