Even though the message of religion is fundamentally flawed, it succeeds on a massive scale. Yes it will. Religion has a chip on its shoulder. As soon as believers hear any voice of doubt they act mortally wounded, as though believing silly things were an absolute human necessity. You cannot preach the evils of drug addiction to drug addicts without them getting angry and resentful.
Religion is the same way.
We should do this compassionately and understandingly, but we should do it nontheless.