What was the influence of Christianity on ancient Russian culture?

What was the influence of Christianity on ancient Russian culture? and can you tell about what other events are narrated by epics? Who are their heroes?

In the 10th century, the Christian religion began to spread in Russia. Orthodoxy had a positive effect on the culture of the ancient Russian tribes. The construction of churches was carried out, religious literature was disseminated, and the external relations of Russia with other Christian states were established. People have become more humane. In addition, folklore was developing in Russia. The inhabitants of the state composed epics and songs based on historical events and phenomena. The main characters were collective images of a Russian person.