This took place after previous unsuccessful attempts by priest Zbigniew Krupski to obtain permission to build a temple at Poleska Street.

On December 22, 1981, additional land for the construction of a church was included in the Spatial Development Plan of the City of Białystok.

In September 1986, the catechetical building was put into use, and on December 22, 1986, Bishop Edward Kisiel consecrated the lower church of Divine Mercy at Radzymińska street.

Michał Sopoćko were moved from the parish cemetery and placed in a special crypt in the lower church - the Sanctuary.

Among others, cardinals Angelo Amato, Stanisław Dziwisz, Audrys Bačkis and Józef Glemp, about 100 bishops as well as presidents of Poland: Ryszard Kaczorowski, Lech Kaczyński and Bronisław Komorowski were present.