Something to consider, and its been mentioned before elsewhere; What we once were and what we will be in the future, is the same as what we are now. We are star stuff, our molecules are the same as they always have been and the same as they yet will be. We are made up of the same stuff as the birds, the fish, the earth, the moon and so on. What matters whether we evolved from pond scum? or just suddenly appeared? we are what we are on this physical plane.
The question in hand is whether we as Pagans believe in reincarnation, I believe most Pagans do believe where as others do not. It's a very personal thing to each person; what I believe as far as reincarnation is concerned may not be the same as another believer holds to be true. There will be no definitive answer until your at the final door. Infact it may be then that you'll also find the final answer to the creation or evolution question too.