No, Uria can not be Special Summoned 'except' by following the text on his card.
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No, "Uria" can only be Special Summoned from your hand.
No, Raviel is what is known informally as a 'nomi' monster, meaning there is 'only' one way to summon him, and that's to follow the instructions in his text. This kind of monster can be identified by the text "Cannot be special summoned except by", and these monsters can't be summoned by Monster Reborn, even if you properly summon them, and they are then destroyed.
No, just like it's fusion materials ("Uria, Lord of Searing Flames" + "Hamon, Lord of Striking Thunder" + "Raviel, Lord of Phantasms") it's both tournament legal and unlimited (up to 3 in your fusion/extra deck)
Yes, the Sacred Beast cards, "Uria, Lord of Searing Flames", "Hamon, Lord of Striking Thunder", and "Raviel, Lord of Phantasms", are allowed to be used in tournaments. The Egyptian God cards, on the other hand, cannot be used. Look at the official Advance Format list to see what other cards are banned or limited in tournaments.