The real God cards don't have effects in their text since they are not considered real cards; just promotional.
But if you do want their effects, check out these Yugioh Wikia pages:
http:/yugioh.wikia.com/wiki/Obelisk_the_Tormentor
http:/yugioh.wikia.com/wiki/Obelisk_the_Tormentor_(Effect_Monster)
http:/yugioh.wikia.com/wiki/Slifer_the_Sky_Dragon
http:/yugioh.wikia.com/wiki/The_Winged_Dragon_of_Ra
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Their EFFECTS are written on the cards. The classic versions however cannot be used in the first place.
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).
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
No. The god cards are stronger than Exodia.
Ygi god CardsWinged Dragon of Ra, Slifer the Sky Dragon and Obelisk the Tormentor, There is also a possible way of fusing all 3 cards to create a sort of Almighty god card ( Yugi did this in an episode against Marik..) Also, in Yu-Gi-Oh! the movie, Yugi did a combination attack with the 3 God cards to defeat Anubis, the Egyptian Lord of the dead(Titan Firestorm).My answer: The god cards are a set of extremely powerful monster cards, each requiring 3 sacrifices and each holding extremely good effects. All three share "This card is unaffected by all monster, magic and trap card effects" (Except for cards that don't specifically target them and cards like monster reborn, but magic cards only work on them for one turn."They aren't allowed in tournaments due to their immense power, but in private duels they can be fun. The cards themselves don't have the effect written on them, so it's a good idea to google the effects and make sure you've got it right, but a lot of sites have them completely wrong.