Sometimes people ask me, "Why do you consider Christianity so special or unique? After all, most of the world's great religions have fine moral codes." (Of course, these people are either not Christians at all or very loose or lapsed in their relationship to Him.) So I agree with them that that is true, but the primary thing about Christianity is not the fine moral code.
I give them this to think on:"When you were very young and tracked dirt in on the nice, clean kitchen floor, how did your mom react? Did she say, 'That's okay, honey, I love you so much that I'll ignore the dirt. We'll all just get along fine ignoring it.'???" Of course not!" [No one's ever said "Yes" to this---what a dump you'd live in if your mom were like that.] "
"And your mom knew you couldn't clean up the mess on your own. So, what did your mom do? She rolled up her sleeves* and cleaned up your mess on her own.""That's how it is with God and sin. God can even less stand to live with the dirt of sinfulness than your mom could with that dirty floor. [Old Testament: 'unclean' was how they often expressed sin or sinfulness.] God is so holy He can't even stand one speck of dirt in His presence---not the tiniest thing. And we're not capable of cleaning our mess up, either. So, God 'rolled up His sleeves'*, became one of us (Jesus Christ) and cleaned up that mess (dying on the cross to pay back Himself for the cost of our sins). "If you grasp this idea first, then nature really properly can become a teaching tool for you. Because then you will know what is real, and you can relate what you take in with your senses back to the truth of Jesus Christ.
*"[Yahweh] saw that there was no one. . . to intercede; so His own arm worked salvation for Him." (Isaiah 60:16)