If the Catholic Church is so evil, then why is it that evil comes against the Church all the time? Did not Jesus say that if satan fought against satan, his kingdom would be divided and fall?

God bless you

'Before offering Himself up as a spotless victim upon the altar, Christ prayed to His Father for all who believe in Him: "that they all may be one; even as thou, Father, art in Me, and I in thee, that they also may be one in us, so that the world may believe that thou has sent Me".'
~ John 17:21