The heart of the gospel is redemption, and the essence of redemption is the substitutionary sacrifice of Christ. They who preach this truth preach the gospel in whatever else they may be mistaken; but they who preach not the atonement, whatever else they declare, have missed the soul and substance of the divine message.
A cat is better than you are, more honest, more graceful, smarter for her size, better coordinated, and infinitely more beautiful.