” 26.  Islam, like Jehovah’s Witnesses and Mormons have progressive revelation. JW’s call it “new light”. Muslims call it “Nasikh”. Jehovah’s Witnesses were once instructed to celebrate Christmas, birthdays and salute the flag, but “new light” changed all that. Mormons, like all Muslims, were originally polygamists until Joseph Smith conveniently received a revelation from God on the eve of the US government outlawing the practice of polygamy.”

Quoted from:  http://www.bible.ca/islam/islam-encyclopedia-westerners-need-to-know-list.htm

On the other hand,

‘Jesus Christ is the same yesterday and today and forever.’  Hebrews 13:8

(Don’t let the name ‘Jehovah’s Witness’ fool you.  Like Mormonism, it is not true Christianity)