Are Angels mentioned in every 'religion'?
What is your idea of what an Angel is?
Do you believe in guardian Angels?
Do you think people become Angels when they die

To answer the questions asked:

1 - no idea! I don't know every religion but I do know that every religion worships (for lack of a better term) a higher power so its possible.

2 - I think Angels is a spirit who has crossed over from this place to the next

3 - Yes I believe in guardian angels and I also think people can have more than one watching over them.

4 - Yes I believe people become angels when they die, but I don't think that everyone becomes a guardian angel.