The Catholic Church is on record stating that life begins at conception That is the basis of their opposition to abortion in all circumstances.  It’s the basis on which they argue that Obamacare violates their (and their followers) religious freedoms (which of course trump any rights or freedoms anyone else may have.)

Catholic healthcare providers and hospitals, being the good Catholic institutions that they are, raised similar objections on abortion (and birth control.)

Regardless of whether we agree with them or not, Catholic organizations have been consistently, “pro-life” and have consistently argued that life always begins at conception.   Under that logic, a zygote or fetus should have all the rights that every other living person has under the constitution.  As a result, conservatives continue to push the inclusion of a “personhood” amendment in various state constitutions, and Paul Ryan continues to push for a federal version.