TO BELIEVE IS TO OBEY. Obedience is the action part of faith. They are linked.
He who BELIEVES ((πιστεύω - pisteuō) in the Son has eternal life; but he who DOES NOT OBEY (ἀπειθέω - apeitheō) the Son will not see life, but the wrath of God abides on him.”
"You believe that there is one God. That’s fine! Even the demons believe that and tremble with fear." James 2:19
WHAT IS THE FIRST COMMAND OF GOD WHEN ONE BELIEVES THE GOSPEL?
Peter answered them, “Every one of you must repent and be baptized in the name of Jesus the Messiah for the forgiveness of your sins. Then you will receive the Holy Spirit as a gift.
In a water baptism it involves...
... Repentance to the Father (Matthew 3:11)
... Belief in Jesus' death on the cross, burial and resurrection (Acts 8:36-37, Mark 16:16)
... Receiving the Holy Spirit & Fire (Matthew 3:11)