Being Catholic and $2 will get you a cup of coffee
Being Protestant and $2 will get you a cup of coffee and a glass of water.
I can’t say I really understand the point you’re trying to make, but I will confess that whatever it may be, the “glass of water” bit confused me. But just guessing, that if your point is that there is not much difference between the religion of Protestantism and the religion of today’s modern popes and bishops (the post-Vatican II version of Catholicism), I would wholeheartedly agree.