Actually Church as a non-profit organization has to accept any kind of currency. But technically it is quite hard to make acception of any crypto coin now, who will convert it ? from which stockexchange ? so many questions...
It will be easy for them if one of the church authority is aware of cryptocurrency and bitcoin itself. That can be an in-kind crypto donation which they can convert to cash for their needs easily. No need to ask who will convert it if someone already know how to.
Bitcoin doesn't need a stock exchange, there are many local exchange or trade through LBC which can be done again by their representative. If the donator can do it, he can just convert it first to cash and send the money to their bank account if ever they had.