"I am a lover of mankind, a democrat and an atheist."When Shelley wrote these words in the hotel register at Chamonix, he was, as PMS Dawson has suggested deliberately, intentionally and provocatively “nailing his colours to the mast”. He knew full well people would see these words and that they would inflame passions. The words, however may require some context and explanation. Many people have sought to diminish the importance of these words and the circumstances under which they were written. Some modern scholars have even ridiculed him. I think his choice of words was very deliberate and central to how he defined himself and how wanted the world to think of him. They may well have been the words he was most famous (or infamous) for in his lifetime.
UPDATE: Hotel Register in Which Shelley Declared Himself to be an Atheist: FOUND
On 19 July 2016, the University of Cambridge made a startling and almost completely unheralded announcement. They were in possession of a page from the register of a hotel in Chamonix: not just any page and not just any hotel. The hotel was the Hotel de Villes de Londres and the page in question was the one upon which Percy Bysshe Shelley had inscribed his famous declaration that he was an atheist, a lover of humanity and a democrat. Not a copy of it….THE page. No reproduction or copy of this page has ever, to my knowledge been made available to the public. Evidence for what Shelley wrote was based almost exclusively on either eye witnesses, such as Southey and Byron, or mere hearsay. we now have access to a HIGH RESOLUTION copy.
Hotel Register in Which Shelley Declared Himself to be an Atheist: FOUND
On 19 July 2016, the University of Cambridge made a startling and almost completely unheralded announcement. They were in possession of a page from the register of a hotel in Chamonix: not just any page and not just any hotel. The hotel was the Hotel de Villes de Londres and the page in question was the one upon which Percy Bysshe Shelley had inscribed his famous declaration that he was an atheist, a lover of humanity and a democrat. Not a copy of it….THE page.