Something I don't understand about Christianity?

Virgil is the virtuous pagan who went to hell due to not being baptized. There are several types of Baptism. There is Baptism by water (most common) Baptism by Fire (just before Judgment Day) There is also a Baptism for pagans who are martyred for upholding christian beliefs. There is also a Baptism for those who have never been introduced to the idea of God. I think it's called Baptism by Ignorance, but I'm not sure.