easter weekend is about the death (good friday) and resurrection (easter sunday) of jesus christ. in xtianity, the death of jesus christ is about atonement for the sins of mankind, sins that were brought into this world by the Original Sin back in the garden of eden.
a lot of good friday services are HEAVY on the guilting. a lot of toxic xtian communities will get judgy about whether or not you cried during service, about the degree to which you feel guilt, because you should feel as if you are the one driving nails through the hands of jesus christ. because he had to die for YOU, because YOU are bad, because you inherited sinfulness, because there is NOTHING you can do to make up for that.
(did you cry during passion of the christ as a child or are you a psychopath? did you look away? how could you look away?)
and if he had to die for you, shouldn't you be willing to die for him? how could you be like peter, denying christ out of fear for your mortal coil, when jesus -- again -- DIED? (cue: factually incorrect, twisted accounts of people killed because they refused to deny being xtian, followed by sermons about how we all need to be like that, unafraid to deny christ.)
the better to have never born bit is from judas, who betrayed jesus (thus causing his execution). most interpretations, in my experience, is that judas was predestined to betray jesus. but it's also said that for The Traitor, it'd be better to have never been born at all, because he's just That Evil And Doomed. and then judas hangs himself, woo!! so anyways that's a fun way to induce life crises about free will and the value of life and all that jazz.