False teachers and Satan appear as Angels of Light

Angel of Light?
1 Corinthians 11
13For such men are (AC)false apostles, (AD)deceitful workers, disguising themselves as apostles of Christ. 14No wonder, for even (AE)Satan disguises himself as an (AF)angel of light.
Whoever believes that false teachers are horrible people should consider this passage carefully. I’ve met very pleasant people who deny Christ and teach things incorrectly about Him. Those that teach “another Christ” or believe contrary to the Gospel are the ones to worry about, not
Those who teach evil and those who deny Christ are easy to spot. It is the slight perversion of the nature of Christ we must fight against. Jesus was either God come in the flesh or he was not. If he were a mere angel then he would not be our Savior.
The first thing you should ask anyone knocking at your door or engaging you in conversation about their beliefs is what they believe about Jesus Christ. Anything short of Him being God in flesh is not the Christ of Christian teaching. It is just that simple.