Nice dodge.
1) If someone is not Christian and they become Christian, they convert.
2) If you accept Jesus of Nazareth's crucifixion AND resurrection, you are Christian. By definition.
3) As far as I'm concerned, "God's requirement to redeem mankind" is between God and each individual person.
4) Jews believe in repentance, Muslims believe in repentance, Buddhists believe in repentance, etc. It's not unique to Christianity.
5) Lastly, and to the point of Rowman's comment, if a student threatens another student with Hell if they don't become Christian, that crosses into bullying. There have been documented cases of Christian students with Bibles following gay students around, constantly quoting Leviticus at the gay students even when they were asked to stop, and when the Christian students refused, they were charged by school administrators with bullying. Then the Christian students whined they were being persecuted. Wrong.