What is the difficulty in putting your faith in the one who died to save you from sin and death?
The difficulty of believing such obviously self-serving tripe, Alan. There's no such thing as sin and everything living dies - yes, you too, Alan. You, Mrs Alan, the little Alanettes, the birds in your garden, the worms under the back lawn - in short, if it lives, it's going to die at some point or other, and nobody and nothing can stop that. A rock can be destroyed
as a rock (by being pulverised, let's say), but a tree dies, because a tree is alive and a rock isn't - death is a consequence of life, something that the theist is obligated to believe was set up by the god in whom they claim to believe. Unless you're of a certain bent which sees you believing in an afterlife for the birdies and the wormies, what you actually believe is that every single other species of living thing on the planet dies and dies completely and finally, but you're special enough to be kept around for ever and ever and ever and ever and ever.
To (slightly) paraphrase my late hero Christopher Hitchens, I've been called arrogant in my time, but that's beyond my conceit. If you can't see that this is self-evidently a narrative created by humans fearful of death, you're beyond hope. It's entirely understandable on a psychological basis, no question of that; but that doesn't prevent it from being rather obnoxiously narcissistic and arrogant in a way that only religion can manage.