There are so many ways Bitcoin can be promoted especially here in Nigeria and wold wide.
Firstly religious leaders play a very interesting roles in the life of people and are seen as role models and mentors some see them as a father figure, so what ever this set of people tell there followers that is what exactly they will all do.
With the numbers of churches and mosques that we have I know if Bitcoins is been enlightened to us through this regions then people will trust and believe in BTC, Bitcoin will surely go more far and spread wide with this ideas.
Secondly Bitcoin is better than saving in a bank because it appreciate while it is been saved in our wallets and it is also an investment, so many people complain from there day to day activities with the local banks of been debited without cause and reducing the expected savings this is not a good reputation and Bitcoin has solve this aspect of issues, with the security of wallets, hard ware and software wallets fraud is been reduced making both the old and the young to believe that they are saved from been scammed through BTC.
#Just my thoughts.
First of all, having faith in Bitcoin always depends on each individual who wants to know what Bitcoin is. Why is it preferred by investors in different countries? In short, for me, there is nothing in religion to accelerate the spread of the number of Bitcoin enthusiasts.
But, I agree with what you say that it is better to save bitcoins than in the bank, as long as you make sure that the wallet you use to save bitcoins is safe in case you don't have to buy a hardware wallet.