Atlanta can only make the playoffs if both SEA and MIN lose the next two games, and Atlanta wins the next both. That would put all three teams at 9-7 and force a 3-way tie-breaker, where the it would take strength-of-victory to identify the 2 winners. In that scenario Atlanta is in and Vikings are out.
BUT, there is 0.00005% chance that both Seattle and Minnesota lose out and Atlanta wins out.