Scripture says the one who calls on God must believe that God exists, not that Satan exists.
Hebrews 11:6
True, both Biblical reference I posted emphasized the subject of salvation.
The question poised in the subject is : “ Does It Really Matter If You Believe In The Devil?”.
The OP indicated he had mental problems, however I at times fail to clarify my position.
This is the plan of salvation as detailed by the apostle Paul in the New Testament book of Romans., and is known as the Roman Road:
Acknowledging Human Sinfulness:
Romans 3:23: “For all have sinned and fall short of the glory of God.”
Romans 3:10-12: “There is no one righteous, not even one; there is no one who understands; there is no one who seeks God. All have turned away, they have together become worthless; there is no one who does good, not even one.”
Understanding the Consequences of Sin:
Romans 6:23: “For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord.”
God’s Provision for Salvation:
Romans 5:8: “But God demonstrates his own love for us in this: While we were still sinners, Christ died for us.”
Receiving Salvation:
Romans 10:9-10: “If you declare with your mouth, ‘Jesus is Lord,’ and believe in your heart that God raised him from the dead, you will be saved. For it is with your heart that you believe and are justified, and it is with your mouth that you profess your faith and are saved.”
The Results of Salvation:
Romans 5:1: “Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ.”
Romans 8:1: “Therefore, there is now no condemnation for those who are in Christ Jesus.”
Romans 8:38-39: “For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord”
Thanks Magenta