No such thing as luck for true Christians. However those who don’t trust Christ obviously believe it. You should trust Christ and not luck.
Romans 14:4 Who are you to pass judgment on the servant of another? It is before his own master that he stands or falls. And he will be upheld, for the Lord is able to make him stand.
Romans 14:12 So then each of us will give an account of himself to God.
I know that. So should those who pridefully presume they are already are saved.
They're betting that God will agree with their own self-judgement.