Christians can and do sin. They do not practice sin, but can sin.
In Acts5 sin did not "bounce off Annanias and Sappharia when they were cut off.
Sin does not bounce off those who took the Lord's supper in an ungodly manner.
28 But let a man examine himself, and so let him eat of that bread, and drink of that cup.
29 For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord's body.
30 For this cause many are weak and sickly among you, and many sleep.
31 For if we would judge ourselves, we should not be judged.
32 But when we are judged, we are chastened of the Lord, that we should not be condemned with the world.
They were not condemned with the world but judged.