If you want to convince him to let him believe in bitcoin, then show him proof that you have made a profit on bitcoin. The proof is the only thing bitcoin skeptics need, they don't require you to explain at length when you have not yet made a return on your investment. Your friend has a lot of money, and if you are poorer than him, there is no reason for him to listen to you. Like me, I would recommend bitcoin to my boss, but he is richer than me, and I can't teach him to get rich. That is ridiculous.
Do you think profit is the only one reason why someone want to buy and use Bitcoin? introducing someone about Bitcoin by the profit you make and you must be richer than the person you want to teach is really ridiculous lol. Some people choose Bitcoin to store their wealth because they don't believe with banks, there were many banks going to bankrupt and people are scared about it. That's true FDIC will insure your money as long as you not reach the maximum amount of insured funds, but there was few cases where the banks collapse and they weren't compensate any funds to the victims.