obscurity and weakness of the most physical mind, vital, material parts to prevent the progress or fulfilment of the sadhana.Sri Aurobindo
Letters of Sri Aurobindo
6. The Divine and the Hostile Powers
Fragment ID: 620
Yes, some kinds of Asuras are very religious, very fanatical about their religion, very strict about rules of ethical conduct. Others of course are just the opposite. There are others who use spiritual ideas without believing in them to give them a perverted twist and delude the sadhak. It is what Shakespeare described as the Devil quoting scripture for his own purpose.
At present what they are most doing is to try to raise up the obscurity and weakness of the most physical mind, vital, material parts to prevent the progress or fulfilment of the sadhana.