It sounds like you loaded the question from the get go.
A) You ask when the last time we attended a 'very good' bible teaching church.
How does one quantify a good bible teaching church?
Does it convert more people?
Does it make more people cry?
Do the members feel touched (in naught ways) by the lord?
I could point out that I was a 16 year Mormon and did lots of bible study in church, as well as seminary before school in high school, but you wouldn't probably accept that as a sufficient answer.
You've given yourself a way out on this question, to assume that we don't believe just because we haven't been taught right, or we're too stupid to understand.
Or that we have been lead astray by the Devil.
Assume for a moment that we had the best teacher on the planet. Some of us spent more time in church then you have been alive, and we understand the teachings to every minute detail with all the differences.
Now let that sink in, and then understand this. We STILL DON'T BELIEVE!