Describe at least three ways christians were persecuted under the romans

They refused to worship the emperor, didn't worship the gods Romans did and refused to partake in any sacrifices. (General hated for the Christians started when they refused to worship Roman gods.)

According to the article "Christian Persecution", three ways in which Christians were persecuted was by making their death amusing. They were “Dressed in wild animals' skins, they were torn to pieces by dogs, or crucified, or made into torches to be set on fire after dark as illumination”.

Simplified

They were dressed in wild animal skins, they were torn by dogs, crucified, or made into torches to be set on fire.

Explanation:

For more information click on the pdf and it will give you the full article.

the crusaders are identified in the painting;

c. by the red crosses on their backs