Looks like he credits Welwood with coining the term in 1984: https://www.google.com/books/edition/Spiritual_Bypassing/Vn3DIzBa0ScC?hl=en&gbpv=1&dq=welwood+inti

Looks like he credits Welwood with coining the term in 1984: https://www.google.com/books/edition/Spiritual_Bypassing/Vn3DIzBa0ScC?hl=en&gbpv=1&dq=welwood+intitle:spiritual+intitle:bypassing+inauthor:robert+inauthor:masters&pg=PA1&printsec=frontcover https://www.google.com/books/edition/Spiritual_Bypassing/Vn3... https://www.google.com/search?tbo=p&tbm=bks&q=welwood+intitle:spiritual+intitle:bypassing+inauthor:robert+inauthor:masters&num=10 https://www.google.com/search?tbo=p&tbm=bks&q=welwood+intitl...