Not if you live in reality lol. Maybe 7 years ago, it would've been debatable but now?...Messi wins hands down, he's a genius (easily legendary status).
Ronaldo can win as many "World Player of the Year" awards as they're willing to give but that'll never make him the greatest in my eyes (or objectively, for that matter). [It's just stupid football politics/business IMO].
Don't get me wrong, I will admit that Ronaldo is an amazingly brilliant player (credit where it's due) but the measurement of "the best of the best" is more than titles, trophies, & skill; it is also about quality of goals/play, passion, character, personality/attitude, play making skills, team sportsmanship, overall development/progress, etc.
Ronaldo
Pros: long shots/LRG, free kicks, excellent speed & strong also, better tricks in general/technical ability(footwork), better athlete, entertaining/"fun"(in a WWE kind of way), more "marketable"($$), hardworking, well rounded, more daring, and physically hotter.
Cons: too dramatic/emotional, diving, big ego/arrogant attitude, flashy, sub par dribbling, age(getting too old; past his prime), not very tactical, SELFISH PLAYER, sore loser, and has become too western/commercial...I'm not sure if it's all the fame and underwear sponsorship getting to his head but when I watch him play, I feel he lacks that sense of true love for football[as more than a sport/job/game].
Messi
Pros: dribbling, control, A1 decision making skills(quick/intelligent thinker/vision), hunger/drive to win, tactical, TEAM PLAYER/good passes, exudes genuine passion/love for football, humble, consistent, spirit/naturally gifted, complex/quality goals, age (prime; more time to set records), and statistically more scores&assists (on average [afaik]).
Cons: non-fans may see him as "boring", weak at defending, :/ headers(but he does good for a short guy lol), and sometimes sub par at penalties.
TLDR;
No, CR7 is obviously great but Messi is
on another level.