B.W.
Could be teething, but its probably just a phase. BOTH my boys went through it about 22-25 months. Refusing naps, not wanting to go to bed at bedtime, fussing and taking forever ot fall asleep.
My advice? Do what works. If he calms when you lay with him for a bit, do that. Its not the end of the world if your little guy needs some mommy snuggle time, and he won't rely on it forever, but if it gets him to bed happily, and you don't have to listen to the little guy scream and fuss.... it will be much better for both of you.
I know you said you have a daycare so that may not fully be possible for naptime, but try it for bedtime. Keep a solid routine, bath, jammies, brush teeth and go potty, read a book, then lights out, lay with mommy or daddy for 3 minutes, then bedtime. IF he knows the routine set in place, he'll be able to better anticipate bedtime and not put up such a fuss.
But again, its the age, and a phase which will pass. I know its hard to deal with, but there is a light at the end of the tunnel, and he's not giving up his naps, so keep putting him down at his regular naptime. Kids go through one phase only to start another... seems you jsut end one and you turn around and are staring another one right in the nose! :)