ATLANTA — The Mets’ Now or Never Tour got off to a pathetic start.

No surprise there.

These Mets don’t deserve to be on the same field as the Braves.

At this rate, there will be lots of changes in player personnel for these much-less-than-mediocre Mets.

Team management stood their ground and kept core players in New York this offseason, but if this season continues to decline in a big way, those jobs will not be safe. Back up the truck.

After the terrible offseason Brodie Van Wagenen had, he will get another crack at making deals. Good luck with that, as Brodie’s Bullpen was abysmal once again.

The Mets began a pivotal 11-game road trip Monday night with an incredibly ugly 12-3 loss to the Braves at SunTrust Park. And it wasn’t even that close.

The Braves look to be in a much higher class than the Mets. The athletic, aggressive Braves played error-free baseball while the Mets struggled even on some routine plays.

As for that bad, bad bullpen, Mickey Callaway finally lost patience with their performance.

“We just stunk. Again. We weren’t good,” he said. “We have got to recalibrate what we are doing and do the job better, plain and simple.’’

Pretty much all the Mets stunk.

If this continues, Callaway will be in the crosshairs because, on this night, the Mets showed no fight and other than starting pitcher Zack Wheeler, the Mets clubhouse was a ghost town.

Twice the Mets messed up relay throws to home as well. The Braves pounded out 16 hits and three home runs, while the Mets had only seven hits as Mike Soroka improved to 8-1.

After two more games against the Braves, it’s four games at Wrigley Field against the Cubs and then four in Philadelphia. Then there are eight more tough matchups at Citi Field before the All-Star break.

The Braves come in for three, the Subway Series Part II features two games against the Yankees and finally three games against the Phillies.

Essentially, this game represented the Mets putting on a blindfold before facing the firing squad.

It remains to be seen how extensive changes may be, but for now the players still hold their futures in their hands. Win games and get back into the NL East (Happy Face) race and everything pretty much remains the same.

“This is a huge series for us, we all know that,’’ Todd Frazier said before the game.

Wheeler then went out and surrendered a leadoff home run to Ronald Acuna Jr., watched the Mets have defensive letdowns and was the losing pitcher as his record dropped to 5-5 and his ERA rose to 4.94. Wheeler could be one of the first traded.

“That’s something you don’t want to think about,’’ said Wheeler, who has surrendered as many home runs (14) this year as all of last year. “I guess it’s in the back of your head. I’m here now and I want to help this team win. I know we are very capable of it. We have a good squad.’’

The Mets have been sabotaged this season by their bullpen, kind of the same old song. GMs change, managers change, coaches change, but the bullpen problems remain constant. Drew Gagnon gave up two massive home runs in the eighth.

Mets relievers have allowed a run in each of their past eight games — which is hard to do. Jeurys Familia was the big free-agent signing for the bullpen in the offseason at three years for $30 million. He was beyond bad again as his ERA climbed to 7.81.

Gagnon inherited a bases-loaded situation in the seventh and was overmatched. His ERA sits at 7.65.

It’s not only been a terrible bullpen contributing to the Mets’ woes — they are 4-12 in their past 16 road games — but the Mets have committed 54 errors this season, the most in the NL. The Mets committed 88 errors all of last season.

Pete Alonso made an error in the first that cost the Mets a run. Amed Rosario once again had range issues at shortstop.

No fight. No chance. Embarrassed by the Braves once again. That’s Met Life.