Sicilian defense question

When playing the Sicilian vs the Grand Prix attack, I play a6 with my pawn, and do a queen side expansion (moving pawns forward), then playing the dragon moving the g5 pawn to g6, to play bishop at g5 attacking the d4 area. (I’m black) *Example*

*note: whites moves are all theoretical, asking if I can do it anyways.

Just take the bishop. Why would you not take the bishop?

I’d have a doubled pawn. Not good.

Doubled pawns are bad, but not taking a big material advantage is worse.

I just do e6 d5 and I'm fine.

I’m playing a different kind of Sicilian so I’m not trying to argue but developing is better than material because I already have my pawns protected?

No... You're fine at the U1000 level if you don't hang pieces and take advantage of your opponent when they do so.

Your theoretical opponent, after moving 5. Bc4, keeps that light squared bishop hanging for two moves. You should not leave a gift like that under the tree. Sure, the engine says you're better after 7. Bg7, but you could be way better way earlier.

What about this variation?

You weakened yourself soooo much there

how?

There are other, much better players than me who might be willing to discuss this defense, but it seems pretty bad to me. In general, if an opening involves 6 pawn moves in a row, it's a bad opening. You might be able to get some success with it but that'd depend on your opponent making very bad moves. And unless you're playing a really sneaky gambit, you shouldn't depend on your opponent making very bad moves.

Overextended + weak kingside

After 4 or 5 moves you develop or get blown off the board

I’m over complicated this by combining two Sicilian variations eh?

That is ok but you should develop a bit more 

that position is much better for white. Black's king is still two moves away from castling (at least) and is giving white the option to open the center. If white can open the center before black gets castled, white already enjoys a lead in development and it will likely be a losing position for black

If your rated 400 I would not recommend the Sicilian. It requires a lot of memorization of moves and you should try to start out playing something less theoretical like the Scandinavian Defense.

not to mention that playing e6 and g6 together severely weakens the dark squares around the king. If white can trade the dark squared bishops off the board, white will have lots of attacking chances on black's extremely weak kingside.