My employer laid me off in September, are they required to include me in the "profit sharing" Christmas bonus this year?

Any right you had to profit sharing would not be on the basis of law, but on the basis of contract.  Did you have a contract which provided that you would be entitled to profit sharing, or did you just receive it as a form of voluntary bonus?  If it was voluntary, it is up to your employer whether or not to give you a share (unless your employer gives others in your situation profit sharing but doesn't provide it to you because of your race, sex, religion, etc .)  If you did have a contract, what does it say?  Does it say that you have to be an employee to get profit sharing, or does it say that you will get profit sharing pro rata for any part of the year you worked, even if you were not employed by the employer by the end of the year?