There is some mystical (Native American) connotations in there that originally set church goers off in the '70s...among other things
https://americansongwriter.com/behind-song-norman-greenbaum-spirit-sky/
I remember getting lectured by some "church lady" one day over the lyrics of Blood Sweat and Tear's "And When I Die". She was upset over "I can swear there ain't no heaven, but I pray there ain't no hell"
Hey, but Jesus is just alright by me..