“Hallelujah” (which was written by Leonard Cohen in 1984, but only became famous when John Cale covered it in 1991) has since been called perhaps the quintessential secular hymn[1][2] despite the lyrics containing strong Jewish themes[3].

Other songs that are sometimes mentioned as secular hymns include “Many Rivers to Cross” by Jimmy Cliff, “I Can See Clearly Now” by Johnny Nash, “Joy to the World” by Three Dog Night, “Hey, Jude” by the Beatles, “Big Yellow Taxi” by Joni Mitchell, “No Woman, No Cry” by Bob Marley, “Going My Way” by Bing Crosby, “Blowin in the Wind” by Bob Dylan, “Like a Prayer” by Madonna, “Both Sides Now” by Joni Mitchell (famously covered by Judy Collins), “Show Me Heaven” by Maria McKee, “Lean On Me” by Bill Withers, “Stand by Me” by Ben E. King, “You Can Close Your Eyes” by James Taylor, “Somewhere Over the Rainbow” by Judy Garland, “Imagine” by John Lennon, “Free Fallin'” by Tom Petty, “What a Wonderful World” by Louis Armstrong, and “Million Reasons” by Lady Gaga, and many others.[1][4]

Source: Secular hymn (genre) – Wikipedia