We should be careful friends not to make the mistake of "other denominations" by attributing the miracles in their gatherings to devils due to their doctrinal differences.
Remember what the Pharisees said to Christ when they attributed his wonders to the work of Beelzebub; "He hath a devil!"
Jesus silenced them; "A house divided against itself cannot stand! Don't blaspheme The Holy Ghost."
There are many mainstream protestant church assemblies that erroneously call tongues (the work of The Holy Spirit) to the devil, just because they are freaked out by it, they forget though that the Charismatic/Pentecostal church is their sister. Likewise, these same groups often say any Catholic is damned to Hell and unsaved due to doctrinal differences between themselves, and their Catholic mother.
High demonic activity is not a litmus test for attributing miracles (which are done by God's power alone, not the power of any pastor, priest, or pewman; ET, or UR it matters not) to their work.
A house divided against itself cannot stand, and a devil does not heal to the glory of Jesus Christ. Miracles are the grace of God on the just, and the unjust - on the ETer and the URer, we are both Christians alike only the ETer is like the mainstream groups who denounce tongues, instead denouncing the grace of God to save all men: But The Father hears their prayers too.
We don't have a monopoly on the works of our Father, just because He has miraculously opened our eyes to the truth of His saving power.
A devil cannot do miracles, he can only do false wonders. Why else does witchcraft cause so much mischief in the life of the crafter? Because the fire he or she plays with is either an illusion...or else it is a false fire that burns, steals, destroys, maims, and blackens - it never heals, it never edifies.
Miracles are always towards a positive goal in God's storyline.