In regards to [ faith ], aside from avoiding the topic, he would continuously reject god.
Why on earth would god created him-through Faust, only to be given self-awareness that he is in fact just be made to 'serve'? Considering his personality, Faust did not treat him very kindly and he picked up on that.
Hatred, ambition, confusion, and when he thought he followed the 'good' footsteps, [ a master who would exchange everything for what he wants ], he turned around from such atrocities~
[ ʙᴇɪɴɢ ᴛʜᴀᴛ ʜᴀʟғ-ʜᴇᴀʀᴛᴇᴅ ᴏғ ᴄᴏᴜʀsᴇ ᴡᴏᴜʟᴅ ᴅɪsᴀᴘᴘᴏɪɴᴛ ᴘᴏᴏʀ ᴍᴇᴘʜɪ~ ʜᴇ ᴡᴏʀᴋᴇᴅ sᴏ ʜᴀʀᴅ ᴛᴏ ᴍᴀᴋᴇ ʜɪs ᴅʀᴇᴀᴍs ᴄᴏᴍᴇ ᴛʀᴜᴇ ᴀғᴛᴇʀ ᴀʟʟ. . . ]
And he did make it come true did he not? Shouldn't he be praised?
Another, A corrupted Saint Graph that fused him with Goethe's legend on Mephistopheles. Which is good for him for he became stronger than what he is supposed to be! Pfft, a demon? That is just an added bonus. Being a [ demon ] means naturally rejecting god, right ? :)
And of course, he is going to hell at a speed faster than his ticking bomb. But he will not go alone. Oh no, he knew very well that he had to bring someone [ everyone ] to this. Since it technically he is already dead, probably he is beyond salvation anyway.
But!
[ ʜᴇ ᴡᴏᴜʟᴅ ɴᴏᴛ ʙᴇ ᴛʜᴀᴛ ᴛʏᴘᴇ ᴛᴏ ᴅᴇɴʏ ɢᴏᴅ's ᴇxɪsᴛᴇɴᴄᴇ. ]