The village, lost in the depths of the Slobozhansky forests, serves as a vivid example of a well-known logical paradox: without documentary evidence, it is impossible to determine what appeared first on the banks of the Mokry Merchik River, a permanent settlement or the church that could have marked its beginning. History has preserved mention of a densely populated fortified palisade from 1665, known as All Saints, and of a church with the same name mentioned fifteen years later. Unfortunately, archival documents have not survived, but practice shows that the first administrative building on Ukrainian Orthodox land was usually a temple. This raises doubts about the long existence of a community without a shrine, especially since the names of settlements often derived from already existing churches in their territory. Thus, the question remains: which came first, the All Saints Church or the sloboda?

In 1691, part of the village, as a dowry for the daughter of the colonel of the Izium Cossack regiment, passed to Fyodor Vladimirovich Shidlovsky and received a new name, Merchik, later adding "Old." Under the new owner, the temple likely continued to exist as a non-parish church, as evidenced by the mention in documents from 1696 of priest Ivan Grigoryev, son of Kapustnyansky, and the absence of the church in church registers. According to a description from 1724, in the village, which was under the management of Lavrenty Ivanovich Shidlovsky, there was one parish in the name of All Saints, and the church was located next to the owner's estate on the right slope of the Mokry Merchik River valley. The following year, the community's activities began to be recorded in metric and confession books maintained by the descendants of priest Ivan, Ivan and Stepan Kapustnyansky.

A new chapter in the history of the Old Merchik church began with Grigory Romanovich Shidlovsky, who, along with his son, started a large-scale reconstruction of the estate complex in 1776. The church was rebuilt from stone in the Ukrainian Baroque style. Initially, the building was smaller, and its bell tower was a wooden structure from the previous church. The completion of the unique shrine is associated with the last owner of the complex in Old Merchik, state councilor Yevgeny Mikhailovich Dukhovsky, who added a refectory and built a two-tiered bell tower in 1881. During the Soviet era, the church was converted into a sports hall for a veterinary technician school.

On February 3, 1995, the parish of the Church of All Saints resumed its activities. The tall silhouette of the two-tiered bell tower above the narthex gives a distinctive appearance to the small three-part church with a semicircular apse and semi-circular roof. Although during the Soviet period the dome was destroyed and replaced with a small cupola, disrupting the harmony of the building. The church, built of brick and plastered, is adorned with simple pilasters, carved window frames, and an arch with a holy image in the apse, emphasizing its ancient Russian style. The architectural elements of the bell tower, such as the pilasters of the Doric order and triangular pediments, correspond to neoclassicism, but the elegant overlays of plant ornamentation and relief symbols help it harmoniously blend with the main volume of the complex.