There is a mouse in the attic, the kitchen appliances may be dated, and the paint in the hall clashes with the living room. The church isn't perfect. It's run by mere mortals who are still learning and trying to work out their salvation too. We learn by failing, so we are given the room to fail. I think you will quickly find that the anti's can't come up with anything better.
Teaching is what our missionaries do.
Ask for no less from others. Seek builders, not destroyers. We have a strange idea that the truth must be able to defend itself from all falsehood. I believe that to be true in the eternities and the final judgment, but I don't think that will necessarily hold on earth at this time. Anyone who has cleaned a house will know that is it much easier to throw mud and dirt then to clean it up.