Final answer:
A plain church interior with little decoration likely indicates that its worshippers practice Protestantism, a tradition that values simplicity and focuses on the sermon and the Bible over religious ornamentation.
Step-by-step explanation:
A very plain church interior with little decoration typically indicates that its worshippers likely practice Protestantism. This comes from a Christian tradition that emerged during the Reformation, which often rejected the ornate art and design found in Catholic churches. Protestant churches are characterized by their simplicity, which is seen as a reflection of their values and focus on the sermon and the words of the Bible rather than on religious images and symbols.
The Christian offshoot of Protestantism did not embrace the depiction of religious figures in their places of worship. Instead, they worshipped in churches virtually without representational ornamentation, focusing more on the teachings and the community. This emphasis on simplicity can also be seen in the churches built by Puritans in New England, which were square and devoid of artwork, and served as communal civic centers as well.