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From a selfish point of view I would rather freethinkers would stay as Muslims because we desperately need them in the battle against the narrow-minded nit wits...................
Agnostic Muslims/Agnostic Isam.,    Free thinking Muslims/Free thinking Islam  were already present since the beginning of Islam....    What is missing throughout the history of Islam is 
 Agnostic Mosques/Freethinkers Masjid  and the political power around it.. So Hassan my suggestion to you is.. 
1). Open a Agnostic Mosque   
Be a Amina wadud for a year or so..   
2). Make that place as 
TAX FREE NON PROFIT RELIGIOUS ORGANIZATION   for donations
3). 
Put a Loud Speaker or two  on that AGNOSTIC MOSQUE and make some sounds .,  Your Khutabhs  .... Your you tubes.....your  posts for the past  10 years or so are good enough to start with and to steer young Muslims out of the rigid rules of stupid islamic literature ..
4). And last but least 
don't forget to start a political party (INDIRECTLY) in the name of Muslim freethinkers  Then ask me to join in it.. I will be there..........