The Church in Rumian is kept in the Baroque style. This temple has the carcass construction; it is timbered from the outside, shingled and mounted on a stone pedestal. The historic interior of the Church is worth seeing. Among others there are the altars here: the late renaissance altar of St. Cross, the Baroque and the main altars from the eighteenth century. The organs in the neo-Baroque outer frame were built by Paul B. Voelkner and are originating from the year 1909. In the Church there are many objects representing the art of goldsmithing: late gothic reliquary cross and pacyficat from the first half of the sixteenth century, the retambul monstrance from the seventeenth century, the reliquary from the late seventeenth century and the Rococo style ostensorium made by Karol Magierski from Torun.