I was on FMLA and 2 days before my return dat Wal Mart dropped me off the schedule for 2 weeks. I was scheduled for all that time. Is this legal?

It is hard to say without more information.  It is unlawful for the employer to retaliate against you for using FMLA.  However, if there is a reason for doing this that is unrelated to your use of FMLA then it is likely legal. You should consult with an experienced employment attorney if you wish to pursue this or to find out if you have a claim.