In modern Catholicism, coffee could be sinful if it is disruptive to your life or connection with God. This is very much the same as alcohol which is normally

In modern Catholicism, coffee could be sinful if it is disruptive to your life or connection with God. This is very much the same as alcohol which is normally fine, but can have a detrimental effect in excess or if addiction develops. There is also some folk history that when coffee started to become popular in Europe, several clergy were concerned about this Islamic drink (coffee having been introduced to traders by Muslims, who cannot drink alcohol). Since wine is central to Christian liturgy, they were concerned that Muslims had developed an alternative to wine and this could be the work of Satan. This was allegedly put to rest when Pope Clement VIII tasted coffee and deemed it to be an acceptable Catholic beverage.