Resident Evil: Resistance Is Not Canon, Says Capcom - IGN

Events within Resident Evil 3's multiplayer mode make it "impossible to fit in the actual timeline," according to the developer.
Events within Resident Evil 3's multiplayer mode make it impossible to fit in the actual timeline, according to the developer.

In case there's still doubts, I believe these are the RE Capcom considers main titles/canon (taken from Village survey) : r/residentevil

Resident Evil HD Remaster - Jill Walkthrough Part 9 - IGN

Resident Evil 3 Remake Sales Hit 4.6 Million Units Worldwide - Siliconera

From what I saw I think RE4 will be a 100% faithful remake with various great gameplay additions and story improvements ( much like RE1 Remake) I wished they treated re2 and

Resident Evil Resistance Gets More Masterminds, Maps

Jill Valentine - Wikipedia

Just fixed the Resistance HUD, much better now. : r/residentevil

Resident Evil Resistance - IGN

Outbreak references to RE2R & RE3R : r/residentevil

Decided to try and make a chart showing every canonical appearance the four main protagonists have made as a playable lead throughout the series. : r/ residentevil