You are faced with a true problem.
There is alot of bad teaching out there and trying to tell people they are listening to bad teaching can be hard thing indeed.
The best thing you can do, is number one pray,
for God's wisdom, and intervention.
next listen to the teaching yourself if the Lord wants you to do something about it.
With actual tapes or transcripts of Bad teaching, bad meaning actual herasy. not just silly. Theres alot of silly teaching out there and alot of silly christians who will pay to hear silly teaching. "there silly but saved" just love them.
You will want to inform your church leadership, if they dont already know, and try to reveal bad teaching to your brothers and sisters, in a quiet and loving way so they can see the truth without embarassing them too much.
unfortunately so many christians out there are not equipped to detect unscriptural teaching.
Like A.W. Tozer said once,
bank tellers are taught how to detect fake money by studying the real, and when they know what the real looks like at a glance they will spot the fake.
Too many christians today dont know the real enought to spot the fake. :cry:
I've heard enough about the redding church to put up red flags for me, but not enough first hand info to say something bad.
you will have to check it out for yourself with a right spirit, and If the Lord shows you something that needs to be addressed, then address it.
God bless.
p.s. you will be persecuted, Its for a good cause. "TRUTH"