The bigger danger than the fact that it could shake the faith of a new believer, is that it can give someone confidence that they are saved when they're not. They can go blithely on their way to hell thinking that they're saved because they have the proof of having spoken in tongues when it was either subconsciously manufactured or a counterfeit of the enemy.
Or that they are not saved when they are. Security of the believer is an issue I often deal with, both with Ex-cultists and other believers both old and new. I know one woman in particular who accepted Christ as a child but questioned her salvation for years because she was constantly told that if she had faith she would speak in tongues.
On the other side, I read an autobiography of Johnny Cash where he stated that he was a Christian for many years and was surprised when he spoke in tongues. In his case, it only happened once and only between him and God. No public display. That is a huge difference than what is usually promoted and has been stated on this thread.
Again, the specific nature of tongues is not clear in the Bible. For me, it is not a doctrine of salvation and I vehemently oppose those who would make it such. I have bigger fish to fry - the cultists.
They can go blithely on their way to hell thinking that they’re saved because they have the proof of having spoken in tongues when it was either subconsciously manufactured or a counterfeit of the enemy.
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Which would be very similar to the ‘spirit’ of Mormonism or the Mormon stories of seeing the dead they are doing ‘the work’ for in LDS temples.
Even when I was a Temple LDS, I questioned the validity of those experiences being from God.