The vast majority of self-identified Catholics either refuse to attend weekly Mass or reject Church teaching on the Real Presence as well as many Catholic moral teachings or simply disobey Church precepts, particularly those regarding marriage laws. When you run the numbers, fewer than 1 in 10 Catholics can actually claim to "adore the Father in spirit and in truth" as Christ desired in John 4:23–24.
Authentic Catholics are united with Christ — Priest, Prophet and King — in the worship, doctrine and governance that He established within His one, holy and apostolic Church. This union isn't an option. In Mark 16:16 Christ declared, "He who believes and is baptized shall be saved, but he who does not believe shall be condemned."
A Catholic is required to believe all the perennial dogmas of faith and morals formally taught by the Catholic Church. Failure to do so is called heresy, as stated in canon 751 of the Code of Canon Law and in paragraph 2089 of the Catechism of the Catholic Church (Catechism). A person espousing heresy isn't a liberal or progressive Catholic, but simply a heretic. Likewise, a person who believes all Catholic doctrine isn't conservative or traditional, but simply Catholic.
To be Catholic, a person is further required to submit to the governing authority of Christ's vicar, the pope, and those legitimately exercising authority under him. Refusal to do so is called schism in the same canon 751 cited above and paragraph 2089 of the Catechism. Such rebels are actually schismatics and not left-wing or modern Catholics.
Likewise, unbelieving and non-practicing Catholics are not united in worship under Christ the High Priest. These self-styled Catholics can't really claim to love Christ either as Christ in John 14:15 declared: "If you love me, keep my commandments." He further elaborated in John 14:24, "He that loves me not, keeps not my words."
Find out what evil is caused by false Catholics in Church Militant's Premium show, FBI—Obama's Counterfeit Catholics.