1) It isn't a sin.
2) It's okay to continue practicing it.
3) Even if it is a sin, it's not a big deal because we are saved by grace.
No. Most Christians wouldn't say this. They would encourage the person involved in witchcraft to turn from this sin.
Persons involved in any sin, who have no desire to stop and repent, are in danger of bondage to sin and the devil.
But the ELCA tells people struggling with homosexuality that 1) it isn't a sin, and 2) it is okay to continue practicing it. Some ELCA people will say 3) even if it is a sin, it's not a big deal because we are saved by grace.
Encouraging people to stay in bondage to sin doesn't seem very "loving." In fact, being in bondage to sin can cause spiritual darkness in one's life, as well as put one's eternal destination at risk.
God tells us to turn from sin because He loves us.
The ELCA tells people struggling with homosexuality to keep sinning because, in all honesty, the ELCA has been deceived by the enemy.
When you were slaves to sin, you were free from the control of righteousness. What benefit did you reap at that time from the things you are now ashamed of? Those things result in death! But now that you have been set free from sin and have become slaves to God, the benefit you reap leads to holiness, and the result is eternal life.
My brothers, if one of you should wander from the truth and someone should bring him back, remember this: Whoever turns a sinner from the error of his way will save him from death and cover over a multitude of sins.