Xenomorph

Catholics are permitted to attend whatever religious observations they'd care to, but aren't allowed to actually take part in worship that differs from Catholic teaching. We can go to a mosque but can't prostrate ourself to al'Kaba, we can walk through a Hindu temple without actually worshipping the concept of God as the worshipping Hindus understand it.

At a Protestant service it becomes a little more complicated. We sing to God as we understand him and we pray to Jesus just like we would at Mass, and this is all good and fine. The Catholic and Protestant understanding of the sacrament of communion, though, are fundamentally different. Catholics believe that the bread and wine actually become the body and blood of Christ just as he himself transmuted the bread and wine at the Last Supper. Protestants typically believe that communion is a remembrance of the Last Supper and an observance of Christ's command to 'do this in memory of me', but do not typically think that the material actually transubstantiates in the way that Catholics do. For that reason, we Catholics will typically either bow our heads and ask for a blessing from the minister or kneel in prayer during the communion portion of the service, and we invite our Protestant bretheren to do the same at Mass.

As for Mary, she is revered for her role as the mother of God as well as her complete submission to his plans for her. While devotion to her is typically much more visible in a Catholic setting than in any other, worship is an act reserved for God alone. The idea that Catholics secretly worship Mary when nobody's looking is malarky.

__________________
The facehugger is short-lived outside the egg which normally protects it. Armed with a long grasping tail, a spray of highly-concentrated acid and the single-minded desire to impregnate a single selected prey using its extending probe, it will fearlessly pursue and attack a single selected target until it has succeeded in attachment or it or its target is dead