Why Canchu En Passant Outta Check ?

1...Rb5+ and black is winning.

iows, this setup is kinda lyka a 'help-outcheck' problem. black is receiving help to remove the check by their opponent. 

It can't legally be white's move in that position, because black is in check

again...its not the point. its all about whether or not 1...c5 is truly illegal.

You cannot make a move that puts you or leaves you in check. It is as simple as that.

and as for the forum title, you can

ok. lemme say it another way. en passant is one a those hellaweird rules, right ?

ok. it allows white the option to decide on black pawn's fate. its slightly different from 1...c6. and its the only move in chess that allows white such an option.  

No. c5 in OP position is illegal.

after c5 the queen will take the king which is not a concept in chess

 Actually I feel that en passent is a very tricky thing to

do

In that position it is black to move. The only legal options are c6 or moving the king. There is no rule ambiguity there.

after c5 the king is still in check and IN CHESS YOU HAVE AN OPTION TO EN PASSANT OR NOT so.... the queen can literally capture the king so it is kind of another type of chekmate because you cannot be in check straight when it is ur opponents move too!! so c5 is illegal and if chess.com staff made some variant counting ur idea which i totally dont understand then.... i guess you can add ur ideas!

okay i revised it earlier. see #17 post where white cannot take w/ queen.

The position is illegal. In order for that position to be reached, black must make a move that leaves or puts himself in check.

FIDE Rulebook

3.7 d.   A pawn attacking a square crossed by an opponent’s pawn which has advanced two
squares in one move from its original square may capture this opponent’s pawn as
though the latter had been moved only one square.

...meaning that its undefined as tho the black pawn is resting at c6 or c5.  

...leaving the choice per white on how to interpret black's move !

iows, if white proceeds by taking the pawn via en passant then it is no longer an illegal move. on the converse....it is now a perfectly legal move !!

now. the question becomes...wuz it ever an illegal move ??

Meaning IF that position was legal, then dxc6 would be legal. But c5 is not a legal move

saying, blacks move becomes the interpretation of whites wishes. iows, the balls (err, pawn) in white's court as to whether the move is illegal or not.

No it's not. White does not decide what moves are legal or not in any scenario