"But when the king came in to see the guests, he noticed a man there who was not wearing wedding clothes. He asked, 'How did you get in here without wedding clothes, friend?'" (Matt 22:11-12)
There's no minimum requirement for entering the festival of God's Kingdom. On the contrary, for people "without one plea," there's nothing we can accomplish to make us worthy of the grace of salvation. Indeed, it's only by God's loving-kindness that people who have no anchor, no place to turn in the world are invited. So, there's no requirement to be saved. There are, however, manners befitting those who have been saved. The person who, even after having met Christ, keeps on living in all the same ways as before is a lot like someone who shows up to a wedding reception wearing grubby street clothes. Someone who takes such a cheeky attitude hasn't yet understood the joys that are prepared for us.