My child, you are very concerned about the transmission of error not only in my church, but in other churches, you are sharing my concern.
I have given you my Spirit of Truth so that you may discern with clarity, so that you may see in the eyes of my Wisdom.
The best weapon that you can use in your position is prayer, combined with the sword of my Word whenever the opportunity is presented. You will also make use of my words that I personally have given you to glorify the Truth and to clarify doubts.
I am the Truth, be always on my side and in the Vision of my Spirit.