There are no specific guidelines established. However, the body must not have been preserved or embalmed in any manner. It must be buried in a manner where it would be subjected to normal decay, not sealed in airtight coffins. The church officials must also eliminate all possible natural explanations for the phenomenon. Certain soil types and climates lend themselves to forming natural mummies of a sort. There are a number of 'incorrupt' saints who are not truly incorrupt as they were actually preserved by natural means. Incorruptibility can never be used alone as a reason for sainthood. In fact, it has little bearing on the canonization process.
Criteria for what? There is no "criteria" listed in the Catechism, various Catholic dictionaries or Canon Law. You will have to ask a more specific question.
I'm sorry, I have been a Catholic for many decades, I spend years in the seminary, and I teach in a local parish and I have NEVER hear of "criteria" for the Catholic Church. Further, I cannot find it in any of my reference materials including The Catechism, several Catholic Dictionaries, and the Bible.
No. It's true that his body has been preserved pretty well, but the Catholic Church does not consider it to be incorrupt in the sense that it is a miracle. His body had been thoroughly embalmed before burial and was sealed in a series of caskets and these factors prevented decomposition.
Of course. The Church would not have declared her a saint if she was not a Catholic.
Canonized
There is no minimum age,
The act of Supremacy weakened the Catholic Church in England because it declared Henry VIII the supreme head of the Church of England.
Yes, but only if his marriage to your sister was annulled, that is, declared not valid by the church
Constantine is only considered a saint in the Orthodox Church and was not canonized or declared a saint in the Catholic Church.
1. He was excommunicated from the Catholic Church. 2. He was (later) declared an outlaw.
Catholics the world over have declared their love, faith and consistency in the Catholic Church. Effectively they have said "we need and want the catholic faith and the church that supports it."Catholics have a mission to evangelize. This means that we they want to share their faith and church with others. In other words everyone needs the Catholic Church, however, some have not yet come to that realization.
Just for your information: There is no such thing as the Roman Catholic Church. That is a term developed by the Protestant Church of England meant to denigrate the Catholic Church. There is just the Catholic Church and all those other non-Catholic religions.