Happy birthday to the Catholic Church! Happy birthday to you, who are the body of the Church! We’re all familiar with our own birthdays, and we celebrate them because they mark the day of the year in which we entered into this life. But did you know you have a second birthday? Because you are part of the body of the Church, Pentecost is the Church’s birthday, and yours as well. And like any birthday, it’s a cause for celebration. The word Pentecost is Greek and it means “50th day.