My best approach would be to show them coinbase.com or xcoins.io or gemini.com and show them how its similar to a bank account. They can log in and check their balance or withdraw to a bank account directly from their wallet.

Tell them that Bitcoin + Coinbase is less costly compared to PayPal: With Coinbase the church can create its own donation button for its website and accept up to $1 million in transactions with no fees (and only 1% after that, compared to PayPal's 2.9% + 30¢/transact. fees). Of course if they accept Bitcoin without any intermediary like Coinbase, there wouldn't even be a 1% fee, either.

Really they're probably not going to know what your talking about unless you visualize it for them. For example in my xcoins.io account it shows my Bitcoin in a dollar amount too so they could see that and not get confused if you know what I mean.

I think you should proceed very carefully. I'm guessing that church finances are managed by older members, and it's a strange paradox that older people are much more likely to believe whatever disinformation they're fed by authority figures. Your treasurer may have been taken in by the gibberish that he/she reads in the newspapers:—

• the factually wrong claims that Bitcoin is a Ponzi scheme (no, a Ponzi is quite different)

• the irrational claims that Bitcoin's transparent & public ledger is good for criminals

• the factually wrong claims that Bitcoin isn't regulated (no, it's regulated by competition between miners and by use of cryptographic signatures to authorize every transaction!)

• the lazy/incompetent journalists' conflation of cryptocurrency-themed scams with the cryptocurrencies themselves

• the unproven dogma that money cannot work unless its supply is subject to manipulation by self-interested politicians and commercial banks.

You could ask why the church doesn't accept bitcoin donations. If you're given any of the above reasons, then nod politely, and accept (privately!) that you're on a hiding to nothing. Unfortunately, Bitcoin provokes irrational anger from people who don't understand that they're prisoners of their social conditioning, and you don't necessarily want to ruin your friendship with them over a lost cause.

On the other hand, if you have the patience to debunk the above fallacies (a slow and delicate task), your fellow parishioners may appreciate the intellectual stimulus.

I'll disagree with the other answers here, by suggesting that for your use case a multi-sig wallet is required (I know Electrum has this functionality, haven't tried any others). But you would need some redundancy in the distribution of signing power, since there's no central authority to help you out if one signatory forgets everything! If the church's bank account requires 2 signatures for any expenditure, it makes sense for the church's BTC address to be equally stringent.

If you or they would like I will walk them through all of the steps they need to get started or they/you can go to my website to get started for yourself, by going HERE You may also want to suggest they get a debit card through bitpay.com then the can load their bitcoins on there and use as needed (like a regular debit card)