Is lightning network censorship resistant?
this is a bit of an old question I assume you've found the answer by now, but I'll answer it so others can benefit.

the short answer is yes the lightning network is censorship resistant.

although naturally some nodes will be more connected and therefor more traffic will go through them, but there is no necessary nodes there will usually be alternate paths between 2 nodes so if a node refuses to let a payment go through the payment will just go through a different path.

more importantly the Lightning network uses onion routing which means each node will only know the node that was before it and the node that came after it, therefore they can't discriminate based on who is the sender or receiver of the transaction.

BOLT #4: Onion Routing Protocol:
https://github.com/lightningnetwork/lightning-rfc/blob/master/04-onion-routing.md