Playoff Birth - NFC South Champions

Ok so lets toss away atlanta and Bucs cause a collapse is not reality, and even if bucs tie us its not going to happen we swept them.

Carolina we are 1 - 0 against, if we lose to them later in the year that would be 1-1 but they are 1-3 in the division we are 3-1

If we beat Atlanta we will be 11-2 with 3-1 in the division, don't we own the tiebreaker going forward and clinch?

or does Carolina also have to lose to Redskins for clinch?

No. Saints win in Atlanta and they clinch. Saints are 9-2, Carolina 5-6. Saints beat Atlanta they are 10-2, and the worst they can finish is 10-6 with a 4-2 record in the division. If Carolina wins out they finish 10-6, split with the Saints, and their division record will be 3-3.

Since the division record is the tiebreaker after head-to-head, the Saints win.