Is the Holy Spirit Misleading You?

[SteveII]

1. Belief that you are being led by God is not the same as being lead by God. 
2. The NT was the last complete revelation from God (which includes saying that it is the last complete revelation from God until the end of time). It has everything in it to have judged the actions of burning witches as entirely contrary to the will of God. 
3. C.S. Lewis was explaining, not excusing. Failure to understand [2] does not create the problem you think it does.
4. The Holy Spirit does not control what people believe and certainly does not stop people from murder.

And the Holy Spirit apparently didn't control what was written in the bible. Exodus 22:18.

Again, how do you know that you are being led by god if belief is no guarantee that you are?

You are taking a command written to the Jewish people living under a theocracy thousands of years ago and trying to apply it to people that it was not directed toward not in the setting that it was written in. 

One way of knowing that you are NOT led by God is if the action is contrary to the teachings found in the NT. Can you think of any historical atrocity that would not have been avoided if that were followed?