No. God Cards are not legal game cards, so cannot be used in tournaments.There are a few legal god cards like ra and obelisk but not slifer not yet
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Players may use the God cards in casual Duels (however, it would be wise if effects were agreed upon prior to the Duel if you are using the tournament-illegal versions). You may NOTuse these cards in officially sponsored Duels or tournaments (tournament-legal versions may be used).
*Polymerization. No, because there is no fusion monster that lists any of them as material mosters. The Creator of Light Horakhty will be released soon, but it requires a tribute of all 3 TOURNAMENT LEGAL God Cards.
Yes, they are. The Forbidden One pieces are restricted to one each, for both formats.
There are not in the game
A tournament legal 'cut' is one that divides a deck into two. Even taking one card is therefore a legal cut, it is the cutting into two that matters, not how many. That means cutting into three is not a valid 'cut' for tournament purposes.