You dont have to believe it happened literally to be a Christian, that's not the faith it's talking about. It's a parable- a story that illustrates a point, lesson, or set of principles. The death and resurrection have a deeper meaning than just "believe this lol and you'll go to heaven." You can think it happened literally, that's fine, but if it didnt happen literally, the principle is negated? Did a tortoise and a hare actually race and the rabbit take a nap to poke fun at the tortoise and lose because he was boasting? Probably not, but that fable's lesson remains even though it didnt happen 'in real life.' Fable uses animals, parable uses people.