The Catholic “general rule of thumb” is 5% to your parish and 5% to other charities.
Was always taught that we give to God from our “first fruits”, not what is left over after taxes.
The Protestant world thinks differently.
From the time a child can have a concept of money, they are taught that 10% goes to their Church. That they should also give offerings above that to other charities, but, that first 10% goes in the collection basket come Sunday morning. If a little kid gets a dollar from grandma, they are taught to give a dime to the Sunday offering. It becomes a way of life.