If you hear something for 7 times, and your brain/memory doesn't actively react to it (refusing it) YOU WILL BELIEVE IT, even if it's 90% lies and only 10% truth.
This is the recipe of propaganda.
This is why propaganda works.
The Nazis knew this.
The Communists knew this.
The Muslims know this.
If you fall for propaganda, it's basically because you are not rooted in Truth.
You may follow religion, but it's not God whom you serve: you serve "religion" (human thoughts about God), not God Himself (in a daily, personal relationship).
The Holy Spirit is your friend. But you need to ASK for discernment!