yes
addition by hillsc: possibly it is not certain what the qeustion marks mean so it is possible that ra is more powerful than slifer but not certain
for me, i would say no
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The most powerful monster in yu-gi-oh is known as "The Winged Dragon Of Ra" it far more powerful than either "Obelisk The Tormentor" or "Slifer The Sky Dragon".
The answer to this question cannot be determined with Slifer the Sky Dragon or The Winged Dragon of Ra because Slifer the Sky Dragon's legal copy has yet to be released and because The Winged Dragon of Ra's (legal version) effect allows a Player to pay Life Points until they only have 100 left to add to the ATK of The Winged Dragon of Ra equal to the amount of Life Points paid.Considering only ATK and DEF, Dragon Master Knight has more ATK and DEF than Obelisk the Tormentor in a sense that it is "stronger".
obelisk
Because there are no official rules for the Egyptian God cards, the only reliable way to destroy "Slifer the Sky Dragon" would be to destroy it in battle with a monster with equal or greater attack. This can be accomplished by using "Honest" while attacking/ being attacked by "Slifer", discarding cards from your opponent's hand to lower its attack, and more.
In the anime, it is only stated that they are more powerful. However, in reality, once all five pieces of Exodia the Forbidden One are obtained in the Hand, the Player is automatically declared the winner, and this declaration cannot be hindered; even if Obelisk the Tormentor and The Winged Dragon of Ra are on the field (Slifer the Sky Dragon has yet to be released as a legal Effect Monster).In effect, yes. If Exodia the Forbidden One was Summoned or Set onto the field, then the God Cards could in fact destroy it.