Of those the only one that matters is Sturridge and Gerrard, and you haven't played anyone particularly good since he got injured. The next couple months while they are out could be a problem.
Few if any of the players you listed were out at the same time and first team members. Sturridge is out but Coutinho was back, Enrique is out, that has improved the team

Aspas hasn't done anything or shown anything anyway.
Teams get 2-3 injuries, that is "normal" and you cope with that, when it becomes 5-6 it gets bad, when it's constant small niggling injuries for others as well, that is when it falls apart completely. With Newcastle they had situations where they had the equivalent players as you did injured, but all at the same time, with significantly weakened first team, where as you are talking about 1 or 2 players not starting games rather than 4-5, that is a massive difference.
IMagine where you'd be if Sahko or Skrtel got injured at the beginning of the season and missed half the season, Gerrard was injured on and off all season, not a few games ago, then add 2 more players constantly out, then have the rest of the team in and out all season, with no change to establish form AND the addition of European games so those that were fit were more tired, travelling more, losing more. Then factor in they have a 60-70mil a year squad and you have a 110-130mil a year squad(I honestly have no idea where it falls these days, it was huge for being so low, then it dropped, I assume it's going up again so is probably somewhere in that range).
http://www.physioroom.com/news/english_premier_league/2012_13/injury_analysis.php
Here is a good table, scroll down, while not strictly accurate it has most injuries and tries to keep track.
Newcastle had almost 50% more injury time than the next most injured team, Wigan. It highlights what a horrendous time they had last year.