Yes! He absolutely was! Left the jw faith in the 80s and stuck with Jesus! He always strived to he christ-like, prayed, and read his Bible, and most of his life he showed all the fruits of the spirit, VERY consistently, He had to come out of a lot of confusion he was taught im sure, both from the jw faith, as well as Hollywood crazieness, probably took him a lifetime, he made a lot of mistakes, but he was definitely a christian! Theres a bunch of rumors surrounding what he believed sadly, and its one of the least talked about things surrounding him, Rodney jerkins both back in the day, and now, mentions he became a christian in 2009, however, as i recall, mj had friends like rev Jessie Jackson, bodyguards, ect, that said he was a christian back in like the 80s, he also included biblical references hidden in some of his songs, such as "earth song" when he mentions "what about abraham?" Telling his listeners to remember their inheritance according to scripture
This song has no date, or info when you search it up on google, but this is something he must have sang somewhere along the line, its clearly his voice in a lower tone
Here's another source with some more info on earth song, and his faith in christ as well

Michael Jackson scored his biggest UK hit in 1995 with his socially-conscious track 'Earth Song'. 25 years on, it sounds as if it could have been written in 2020.
www.smoothradio.com