repent and ask forgiveness
Because at Advent, we prepare for Our Lord's Coming, which is what St. John's ministry was for.
I am not sure what you mean by Advent Saint. There are hundreds of saints who have a feast day during Advent, including St. Nicholas of Myra. However, if any saint would be named as the Advent Saint it would be St. John the Baptist as the Gospels during Advent speak of him preparing the way for the Lord.
John the Baptist lived during the reigns of Augustus and Tiberius.
John devoted his life to God. As far as we know he did nothing really bad during his life.
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No, he wasn't. It was his son who ordered the death of the John the Baptist.
Isaiah longed for the messiah, Mary had expectation of the messiah, and John the Bapist recognised the messiah. And so together they offer a threefold theology of advent. There are some beautiful icons with these three biblical characters together.
There is a St. John the Baptist but no St. John Paul the Baptist.
John the Baptist was never married.
The woman helped by Mary during her pregnancy was her cousin Elizabeth. Elizabeth was also pregnant at the time with John the Baptist, the prophet who would prepare the way for Jesus.
John Baptist de la Salle's last words were reported to be "God is with us."
Actually nobody did baptize John the Baptist.