Nope. Not true. This is a CATHLOLIC idea. Not Christian at all.
All Christians believes in prayers for the dead before the Protestant Revolution. Rejection of praying for the dead is a heresy.
Who are you to say what’s Christian and what’s not? All you have is your own personal private interpretation of the Bible against 16 centuries of Christian teaching.
I take it that you are smarter than St. Augustine or all of the Christians who lived before the Protestant Revolution.