Sincerely speaking, after taking a look at all what your friends said, I have come to realize that they lack the basisc understanding of cryptocurrency. They are ignorant, and yet fail to accept the fact that they don't know and want to learn.
5. He believes that Bitcoin is essentially a religion, so it's okay to be bullish, but it's nonsense to talk about blockchain killer applications.
So, tell him bitcoin has never been a religion and can never, it's a currency just like the US dollars, or a store of value just as gold but in the digital form, not controlled by any government laws, secure and can be used as a medium of exchange for transactions.
But however, I don't blame him that much, because from my country where I come from (Nigeria).. it takes only the grace of God to be able to convince anybody who was a strong victim of the 2017 MMM scam which was rampard in the entire country... Because those set of people fine it very deficult that any legit online exist.