Are there canonical texts for secular Buddhism? Does secular Buddhism have a set of texts that are particularly relevant to it. I can imagine that there are texts that won't have any relevance to secular Buddhists such as the twin miracles. But are texts that have particular resonance even insofar as developing in a set of texts that could almost be described as a canon (in the making maybe?)
I think it varies tremendously based on what tradition they are adapting their teachings from. People following a secularized vipassana tradition probably uphold the Satipatthana sutta, and secular Zen practitioners probably take interest in the Heart Sutra, the Diamond Sutra, and the Platform Sutra.

From my interactions with secular Buddhists I get the impression that when they do study canonical texts they don't have a very wide selection, just a few that they consider important.