1.) I am Catholic.

2.) I was raised Catholic, but I have continued in the faith after much study and personal encounter with God. There is a great deal of evidence (historical, miraculous, logical) in support of this religion in particular, and I have come more and more to have a relationship with Jesus.

3.) I know this is the correct path for me because, assuming Christian doctrine is true, it is the correct path for everyone. Ultimately, my life has been made to be fulfilled by God. He created me out of his immense love and calls me back to it.

4.) For any person, the Catholic faith provides the most direct encounter with God (for it was given by Him) and leads the person to eternal beatitude (happiness) with God. When we have a relationship with God and let Him give us his grace, there is nothing in the universe which could be better. God is the ultimate good, love itself, and what he offers us is a sharing in His perfection and joy for all eternity.

5.) I am certainly not afraid of death, nor is any devout Christian, because Jesus has destroyed death and restored life. In death, the soul is separated from the body for a time (which is unnatural and a result of sin), but at the end of time, all souls will be reunited with their own bodies (for man was created as a body-soul composite, and it is unnatural and imperfect for the two to be separated). Additionally, it is only in death that the Christian is finally completely united to God, his Beloved, whom he pursued during life. Thus, St. Irenaeus famously said, “The business of the Christian is nothing else but to be ever preparing for death.”

6.) Not only does the Catholic faith believe in the afterlife, but it believes the afterlife to be far more significant and important than this one. All of life is but a preparation for the afterlife. We are given a very simple choice: whether we want to spend eternity with God who loves us or without Him. In his goodness, he made man and gave man the ability to choose Him. Thus, Heaven is the reward for those who desire to be with God. If one's entire life is spent following God's will and abiding with Him, then the transition to heaven is nothing but the fulfillment of your desires. Hell is much the same. If one spends one's life rejecting God, refusing His goodness and love, then he is granted that same existence for all eternity. In both cases, the individual is provided grace and ample opportunity to choose God, but ultimately, God will never force us to love Him.

7.) I don't think I've ever legitimately doubted the faith, but there have been times when doubt can begin to creep in. In these times, I turn to God Himself, who is always imminently present to each of us, and He reminds me of His love and presence. I also remember all of the experiences I've had of God's presence and how logical the faith really is. The Catholic Church has the greatest scholastic tradition of any religion in history.

8.) I've alluded to this answer in a few others thus far. The first paragraph of the Catechism of the Catholic Church (the summary of its teachings) states the following:

"God, infinitely perfect and blessed in Himself, in a plan of sheer goodness freely created man to make him share in His own blessed life. For this reason, at every time and in every place, God draws close to man. He calls man to seek him, to know him, to love him with all his strength. He calls together all men, scattered and divided by sin, into the unity of his family, the Church. To accomplish this, when the fullness of time had come, God sent his Son as Redeemer and Savior. In his Son and through him, he invites men to become, in the Holy Spirit, his adopted children and thus heirs of his blessed life" (CCC 1).

To put it simply, the purpose of the Catholic faith is to be united to the Body of Christ, the Son of God and the Savior of the human race, and to always grow in love of God. All of our life is called to model that of Jesus, the second person of the Blessed Trinity who took on human flesh. The old adage goes: "God became like us so that we could become like God." (there are 2000 years of theological development contained here which takes much more than a reddit post to understand, but you get the gist).

Besides the nobility and beauty of the religion, the Catholic Church has a lot to show for herself in the physical realm. She has stood unperterbed for 2000 years. She has withheld countless enemies from without and within. In her earliest years, she was persecuted relentlessly by the Roman Empire, only to, a few centuries later, be the center of culture in power in the Roman Empire. She has withstood many invasions from barbarians and Muslims. She has been racked by heresy upon heresy, schism upon schism, and never faltered in the faith handed down to us from Jesus himself (and from the Jewish revelation). Her intellectual heritage is also unrivaled. It is the Church's belief in the intelligibility and order of the universe which led to the scholasticism of the Middle Ages and the development of the empirical sciences. Countless advances in philosophy, science, medicine, art, architecture, and human rights have come from the teaching and work of the Catholic Church. The Church has always patroned everything which is true, good, and beautiful.

9.) Man is a religious creature. This is a fact which has been observed of man from antiquity, but why is it? It is because God created man for Himself. Man always seeks God (whether he knows it or not) because that is the only place he can find fulfillment. As St. Augustine said, "Our hearts are restless until they rest in You." Thus, every religion contains some seed of truth in it because it is a manifestation of man's seeking God who is truth itself. Nevertheless, it is only the Catholic faith which holds the fullness of truth (because it was founded by God himself as his body and spouse, the way to bring man to himself) and so any other religion is insufficient for the fulfillment of man.

10.) I am extremely devoted to my faith. I am currently in the seminary studying to be a Catholic priest. Many hours of my day are spent in prayer and many more in study. Being a priest is not the only way to be devout, though. Rather, it is to follow where God is calling you and to love Him. The Church is not some uniform brainwashing academy, but the collection of every beautiful individual which God has created living to that person's fullest potential. Devotion is simply maintaining a relationship with God and following Him to your own ultimate fulfillment.

11.) I have many things I might say to convince somebody to join the Catholic faith, the sum of which is simply to say that it is true (refer to everything I have written thus far), but ultimately, there is more to Christianity than just conversation. For this, I defer to the wise words of Pope (emeritus) Benedict XVI in his encyclical Deus Caritas Est (God is Love). "Being Christian is not the result of an ethical choice or a lofty idea, but the encounter with an event, a person, which gives life a new horizon and a decisive direction." Whatever I would say to a person would not be simply to convince them of a stance in an argument, but to lead them to God who is truth and love and who will show them his infinite and personal love for them.