...” slandering Christisns is slandering Christians”....
What makes you think they’re Christians? How do you know? If they were Christians why would they oppose God’s written word?....why would they claim that which is not supported in Scripture?...why would they bow down to images and various other practices God forbids....?
Be sure you know their status in the Lord before you call slander slander when it is something else altogther.
Are you saying that Catholics are, by definition, not Christians?