I seem to remember being able to enter Neriak as a gnome rogue, follower of Bristlebane, with the Mask of Deception on. I'm pretty sure if you choose Bristlebane, that you will be fine since he is a neutral deity. What other deity would a bard want to worship, other than the God of thieves, and bards?
It's been many years, so maybe someone else can confirm.
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