Cincu was one of the seats and seats of the Transylvanian Saxon administration; among other things, a royal judge was based in Cincu. The construction of St Mary's Church, a Romanesque Basilica with three naves and pillars, began in the first half of the 13th century, and it stands out with its tower rising more than 49 metres into the clouds. Over the years, the church was renovated several times and took on the Gothic character that is still visible today.

The central image on the altar depicts the unbelieving Thomas, to whom Jesus shows the wound on his side. The Apostle Thomas kneels at Jesus' right hand. The two main figures are surrounded by the other disciples. In the background is a portal arch through which one can see a mountain landscape. A Latin inscription attests that the altar was painted by Vincentius in 1521.

Four epitaphs hang in the church: from 1708 for the priest Johann Kisch, from 1739 for the priest Petrus Hermann, from 1736 for Martin Sutoris and from 1745 for the royal judge Georg Salmen.

The present organ is a work of the Rieger company from Krnov in the Czech Republic. It was installed in 1905 and has two registers, pedal and 9+7+6 manuals. The Renaissance-style pulpit has six panels. The sculpture has the following themes: lamb with cross and serpent, pelican with chick, vine with sparrow, dolphin whose tail ends in a flower and floral ornaments. A dove hangs under the pulpit canopy. The pulpit reads 1649 and 1758.

A late Gothic sacrament niche is built into the north wall of the choir. Between two pillars ending in pointed tops is a rectangular niche.

The church once had two defence rings and was heavily fortified, but today much of it has eroded away. However, parts of the first ring of the south wall and the eastern ring behind the chancel still exist today. The old school can still be seen on the right-hand side in front of the church entrance.

The large bell, cast in 1512, was rebuilt in 1754. It melted in the fire of 1789 and was restored from the remains of three bells.