The Serpent is a symbol. The Serpent (Satan) in the Garden of Eden tempted Eve to take from the Tree of Knowledge and bite the apple (gnosis). The Vatican worships the Serpent (satan/lucifer) for giving them the power to be Gods on earth thanks to Gnosis (knowledge), while keeping the masses in the dark.
It's got nothing to do with the Elites being reptilians. If you believe Pope Francis and the Jesuits are reptilians you're being fooled.
With all the provable conspiracies going on every time David Icke was on the BBC he would waste all his time on the unprovable reptilian thing instead of focusing on real evident conspiracies .
Having said that there is some truth to bloodlines originating from the first men who probably were not human (Anunnaki etc) but if I was invited to a TV show it would be the last argument I'd cover, I'd focus on the provable conspiracies first.