Roman Catholic Resources

I am a firm believer that Catholics and all denominations of Christianity are one in the same religion with some traditions and customs. However, all worship the same God who sent his son to earth, etc. .. you know the rest of this amazing story.   My question is for Catholics, on what basis he prays [...] Related posts:

1. Why do Catholics believe that it is better to pray to Mary or a saint instead of going straight to the source, God?
2. Why Catholics pray the rosary, confess their sins to priests and pray to saints?
3. Catholics pray to Mary and the saints for intervention. Why is it that the Saints Prayers Receive?