An alternative for "revisionism" [closed]

You can say that you mythify or mythicize someone (or something).

myth·i·fy [mith-uh-fahy] verb (used with object), myth·i·fied, myth·i·fy·ing. to create a myth about (a person, place, tradition, etc.); cause to become a myth. Origin: 1905–10; myth + -ify

mythicize /ˈmiTHəˌsīz/ verb [with object] turn into myth; interpret mythically.

I would add heroification to the list. This is the act of sanitizing history and raising people to the level of heroes (or saints) by ignoring all their flaws and idealizing their positives. For a great read, see "Lies My History Teacher told me" by James Loewen.