I doubt that many people realize that *speaking in tongues* is not necessarily restricted to Christianity and Spirit filled Christians.
There are other religions that practice it as well, so yes, it can be faked.
As far as other *manifestations, there is something called the *kundalini spirit* that has infected the church and produces the kind of manifestations that people now say are from God, things like being slain in the Spirit, *drunken glory*, *holy laughter* etc.
I found this video some time ago that I thought was very interesting dealing with it.
The Kundalini Spirit has Invaded The Church Masquerading as The Holy Spirit !!! BE VIGILANT!
https://www.youtube.com/watch?v=WfXmDkQiE2o
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