- Actual Grace http://en.wikipedia.org/wiki/Actual_Grace
- Sanctifying Grace http://en.wikipedia.org/wiki/Sanctifying_Grace
The former you acquire through the grace of your thoughts and words and deeds.
The latter you have conferred upon you by a member of the priesthood.
Catholics dislike Protestants who dispense with the services of the priesthood because the whole basis of Catholicism is about proclaiming that they have a top priest ie the Pope who would be the moral arbiter of the whole of Christendom. It is therefore a very centralised and necessarily hierarchical hierarchy. They know that any Christian who dispenses with the Pope will start altering Christian doctrine until it is no longer recognisable as Christian doctrine eg gay marriage and female bishops. The centre must hold, or all is lost, is the Catholic view.
Sanctifying grace is a concept designed to perpetuate the role of Catholic clergy by giving them something to do, eg perform baptisms and last rites.
Jews and Muslims who have made a point of not having a celibate but corrupt priesthood therefore do not have complicated requirements with regard to the kinds of grace you are required to have in order to enter heaven. Rabbis and imams are not considered by Jews and Muslims to be imbued by any special powers to confer grace and run their religion in a more egalitarian and transparent way..
http://www.catholic.com/tracts/grace-what-it-is-and-what-it-does Read this to experience the true meaning of long, confusing, incoherent, boring and intellectually vacuous.