In my own opinion,it much better if we will use our bitcoin those poor people who really needs help,rather than,to donate it into the church. I believe that helping poor people in any form,our almighty God will be appreciated it,and you will also be blessed.
Even crypto plays in the world, it would be better to give donation in cash because church is not that who work on trading to gain profit they are lot to do rather than checking for the price of bitcoin to change. Maybe dollar can do because banks can have exchange it.