This definately is an interesting series of cards. I just wanted to point out that there are quite a few more cards that most of the spell/trap cards affect (Shining Angel, Angel 07, and Doma the Angel of Silence are just three that would work due to their having "Angel" in their names).
As for the cards themselves, I'd recommend that you temper Gabriel's stats a bit considering it is lvl 3. Angelic Shield is also a bit too powerful. I would recommend a continuous LP payment to keep it instead of a LP payment to get rid of it since the monster will be unkillable.
On the other hand, I would say that Archangel Rafael is a little UNDERwhelming, maybe bump it up to at least 200 LP.
As it is, there are a few errors in your card language, but I feel others are better at editing text than I am! :P Hope I was helpful!