The Abbasids were the most successful caliphate and at there Golden age had debates between atheist's, Christians, "philosophers", and Muslims. Even up to the time of Ibn Taymiyyah he debated philosophers, Christians, and atheist's. The idea of "Sharia" imposing men to grow long beards and women to wear jilbaabs is a fabricated notion and a myth!! Even in Rome which was the richest city in the world, the average person didn't have access to clothes that could precisely reach the ankle and cover most skin let alone be able to cover your hair and face. Yes, you can say how human implemented the deen doesn't mean that it is the correct way! I'd agree but this doesn't give you the authority to say, "that's bidah go to jail" , or, "That haircut is haram". Like come on, are we going to follow the deen at gun point or are we going to implement what Allah (SWAT) said ,"There is no compulsion in religion".