Religion is not an indication of faith. Religion is an indication of the absence of faith.
Do you believe that you must follow Calvinism, Catholicism or some other religion to be saved? Jesus is the one that claims to be your savior and the savior of the whole world, 1 John 2:2. If that is true, then why do you follow or need a religion? How can Calvinism save you? What if you are wrong about predestination? Will you be lost. Same thing for Catholics. What if you find out that the Catholic church does not save anyone, will you be lost?
These religions do not promote faith in Christ, instead they promote faith in something other than Christ and his Gospel. Religion, whether it be the Calvinist religion or the Catholic religion are all a diversion away from Christ and his Gospel. None of it leads to the truth that is found in Christ and his Gospel.
If the Gospel is "The power of God unto salvation" Romans 1:16. Then how can you believe that Calvinism or Catholicism will save you? There is no power in religion, because there is no Holy Spirit in religion. The only thing in the Bible that has power is the Gospel of Jesus Christ. On the day of Pentecost the Gospel came into the world in the Power of the Holy Spirit. Thousands heard the Gospel, believed and were converted to Christ, Acts 2:41 also Acts 4:4. There was no religion involved in this event. They heard Peter's Gospel, they believed Peter's Gospel and were saved. Plain and simple.
Which proves Paul's message that, "Faith comes by hearing and hearing by the word of God" (which is the Gospel) Romans 10:17. The moment that one believes the Gospel they are eternally reconciled to God by Jesus Christ, 2 Corinthians 5:18,19.. All that Jesus did in his life, death and resurrection becomes theirs. They are justified by faith, because they have been justified by Christ, Romans 3:26. No religion was needed. What could one possible add to the Christ event that would save them or make them better than what Christ has made them?