The religious beliefs or lack thereof of the ponies is not touched upon, nor would such a thing be discussed in a children's TV program that is not religiously oriented.
The show hasn't sayed anything about Twilight's middle name all we know is that her name is Twilight Sparkle.
Most likely, she will.
There is a good chance of it. There is going to be a third movie, and the scene with the other Twilight appears to have been a sequel hook.
Twilight Sparkle
Twilight Sparkle
Lilac.
Yes, Twilight Sparkle will live in the Castle of the Royal pony sisters when it is repaired.
Twilight infers a time of day when it is safe for vampires to come out and not sparkle. (:
Spike
To study Friendship.
The sun makes their skin sparkle.
If they sparkle they are a Twilight vampire.