Presbyterianism is a family of Christian denominations within the Reformed branch of Protestant Western Christianity. Presbyterians believe that churches are buildings to come to worship God. The decor in some instances may be austere so as not to detract from worship; however, many Presbyterian churches in North America, Scotland and France can be rather ornate in appearance.
The differing factor from a Presbyterian church and a Roman Catholic church may be the placement of saints and very ornate statues and altars that the Roman church may still retain. In a Presbyterian (Reformed Church) one will not usually find a Crucifix hanging behind the Chancel. However, one may find stained glass windows that depict the crucifixion, behind a chancel.
Presbyterianism Wikipedia Entry