Why did artistic works of the life of Christ become so controversial in the 8th and 9th centuries? pllslss heeelpo

Because in the 8th and 9th Century Byzantine Empire there was a so-called  Iconoclastic Controversy, according to which some believed that representation of Jesus Christ on icons is a blasphemy and that they should be removed.

Explanation:

This controversy was a very important part of everyday life in the Empire, as some rulers officially supported this fight, and even were making monks to get married, icons to be removed from church. This controversy lasted until middle of 9th Century, when empress Irene abolished this custom.