Don't have to ask a Wiccan I can ask myself having been a practicing witch in the past. And no I did not believe in a personal devil, but the very fact that Wicca teaches there is no Devil is part of the reason it should be shunned because such a teaching is dangerous beyond belief to the immortal souls of those duped into believing it.
Concerning denominationalism two questions were raised as one.
I think God will gather His people from the Earth by any means He sees fit and it is not by human wisdom that He will do so. I do not believe a person will be held accountable for not having heard the Name of Christ (assuming they have not heard the Name of Christ) but that does not excuse anyone for rejecting the Natural Knowledge of God that all men have.
But that is not a question of denominations.
I think it is beyond a stretch for any denomination to call itself "true" absolutely because corruption enters everywhere and for this reason there is no Church in which every person is going to Heaven. However I think that the Gospel, even clouded as it may be in many quarters of Christendom, is still the power of God unto salvation and therefore able to save even veiled and blended and confused with Law in every sermon and meeting.
Once again it is the grace of God that saves not the sign on the front door.
And why should I not say the confusion that has been sown by multiplied religions, denominations and crass syncretism being couched as "religious studies" is a work of the Devil? Scripture is clear that God does not author confusion and in every corner (and most seminaries) students are taught that religion is all pretty much the same and its a big tent with room for everyone, but the simple fact that one statement generated so much furor is proof that is not true.
The simple fact is, it is not the similarities that make a religion true but rather the quality of its truth claims, and as soon as a truth claim is made; it is made to the absolute exclusion of all other truth claims.
Therefore there really is only one truth, and if all religions are on equal footing then there is no God and they are all false.
But if any truth claim is true then all other truth claims are lies, and lies do not originate with God.
I am persuaded the truth claims of Christianity are true.
Therefore I am also persuaded that all non-Christian religions ARE inventions of Satan and his followers. Even though they may be deceived and well meaning and trying help, that only proves the folly of human wisdom, and should shame the Church to ever greater outreach and evangelism.