user41513: From the Bitcoin Lightning Network:

it is possible to find a path across the network similar to routing
  packets on the internet.

Is routing approach of Bitcoin Lighning Network performed in a "decentralized" and "trust-less" manner ?
Also, the fact that in the Bitcoin network there is no routing table does not matter ?

user90088: Is routing decentralized and trustless:
Generally, yes. It uses sphinx onion-routing to prevent any peer along the way to know origin/destination of payment. 
Also note that Information of channel balances can leak if routing attempts are used to probe liquidity along a route.
Routing is not robust against sybil attacks, as compromised nodes can determine routes by reconstructing path via payment_hash in the htlc output scripts.
It is, however, incumbent upon the channel operator to ensure the lightning implementation is always synced with a full-node. Only this way can it detect a cheating channel counter-party and broadcast a penalty transaction. Watchtowers may provide vigilance as a service but they are not trustless
Also, note that the lightning network is a separate p2p network.
Discovering topology occurs with peers gossiping.

41513: <p>From the <a href="https://lightning.network/" rel="nofollow noreferrer">Bitcoin Lightning Network</a>:</p>

<blockquote>
  <p>it is possible to find a path across the network similar to routing
  packets on the internet.</p>
</blockquote>

<p>Is routing approach of Bitcoin Lighning Network performed in a <strong>"decentralized"</strong> and <strong>"trust-less"</strong> manner ?</p>

<p>Also, the fact that in the Bitcoin network there is no <strong>routing table</strong> does not matter ?</p>
 90088: <p><strong>Is routing decentralized and trustless:</strong></p>

<p>Generally, yes. It uses sphinx onion-routing to prevent any peer along the way to know origin/destination of payment. </p>

<p>Also note that Information of channel balances can leak if routing attempts are used to probe liquidity along a route.</p>

<p>Routing is not robust against sybil attacks, as compromised nodes can determine routes by reconstructing path via payment_hash in the htlc output scripts.</p>

<p>It is, however, incumbent upon the channel operator to ensure the lightning implementation is always synced with a full-node. Only this way can it detect a cheating channel counter-party and broadcast a penalty transaction. <strong>Watchtowers may provide vigilance as a service but they are not trustless</strong></p>

<p><strong>Also, note that the lightning network is a separate p2p network.</strong></p>

<p>Discovering topology occurs with peers gossiping.</p>
