How did the church benefit from converting new nations to Christianity?

Due to the increase in the population of those who believed in the Christian faith, the number of the population of the state, which lived according to general principles, increased, the number of interreligious conflicts decreased. The culture and traditions of all peoples became common.
Beliefs in several Gods receded into oblivion. The population began to believe in one God.
The territories that were under the general influence expanded, a single army was formed.
With the tithe collection, the amount of income of the church increased.