Well, first of all, with the moves up there, White can play 9. Bxf7+, winning the queen.
As to where Black should deviate, it's 6. ... e6 or 6. ... Nbd7. 6. ... Nc6 is a little inaccurate; the best way to recover is probably 8. ... Nd7.
e5 in sicilian to sacrifice pawn and expose black's king?
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Nd7 i think is the best move
I actually don't play this as white, but I'm having a suitable defense as black.
Here's what it normally looks like.