Zero,
I can only reiterate what has already been said; You can do the ATPL without the 'A's but you will find it virtually impossible to get employment without them - trust me, I know of at least 6 young pilots in exactly the same position at the moment and the RAF and all the majors won't touch them with a barge-pole without their 'A' Levels.
Whatever you do, go back to college, do the 'A's, THEN do the ATPL - by which time, it's predicted that the industry will be crying out for pilots and you'll land yourself a great job.
Good luck and we'll see you on the flight deck in a few years time.