When I read this article, it made me think of the Maria Divine Mercy messages, called "Jesus to Mankind" on Facebook, and the website has a different name too. Many MDM apostles ask, "If the messages encourage the rosary, chaplet, mass, adoration, etc., then they CAN'T be bad. Satan wouldn't encourage these things."
The MDM followers are wrong. There are myriad cases where Satan appeared as good to promote bad. Here is a good article on this topic:
Can evil spirits be good?
A: Yes indeed, evil spirits are experts at deception. Our Lord, speaking of the devil, pointed this out: “When he [the devil] tells a lie, he speaks in character, because he is a liar and the father of lies.” And St. Paul states this explicitly: “And no wonder, for even Satan masquerades as an angel of light” (2 Corinthians 11:14). The modus operandi of demons is deception and dissimulation. For this reason, exorcists are forbidden from engaging in conversation with devils – they may only ask questions necessary for the rite of exorcism itself.
Take the High Road
Read more: http://rcspiritualdirection.com/blog/2013/04/29/can-evil-spirits-be-good#ixzz2S0bCrE23