The believers need to find out where their belief come from, who teach them to believe. Was it God or was it man who teaches you to believe. If you're honest with yourself you will admit to yourself that you believe because others got you to believe.

Believers do not know the truth, so if you receive your teaching from believers, your teachings will be false teachings. Beliefs are the teachings of beings who do not know God themselves. To follow these teachers means that the blind following the blind.
God teaches you to know who God is. God does not teach you to believe in