Believing in God's Word, doesn't mean just the element of believing. It involves also - obedience to God's Word. Below, you can see how these Bible scholars in Jesus' time - in spite of their high level of Bible knowledge - had never "believed Moses". Jesus said that if they'd believed Moses, they'd have believed in His teachings too.
I listened to Detriech Bonhoeffer, last night after bedtime - in bed. He also emphasized how the reception of salvation must be accompanied with the willingness to obey God. And he said that many teach incorrectly on this - which leads many to a false assurance of having been saved. This is a serious problem, as many such people will find themselves among the rejected "goats" on Judgment Day - see Matthew 25.
John 5:44-47
44 How can ye believe, which receive honour one of another, and seek not the honour that cometh from God only?
45 Do not think that I will accuse you to the Father: there is one that accuseth you, even Moses, in whom ye trust.
46 For had ye believed Moses, ye would have believed me: for he wrote of me.
47 But if ye believe not his writings, how shall ye believe my words?
KJV
I agree that obedience is important.
"Don’t you know that when you offer yourselves to someone as obedient slaves, you are slaves of the one you obey—whether you are slaves to sin, which leads to death, or to obedience, which leads to righteousness?" Romans 6:16
BUT, it is a result of God saving us. It is the Holy Spirit working in our hearts and minds, to change us to be more like Jesus. Jesus was obedient even to death. We simply cannot earn our salvation by being obedient, even though it is accepted as a step in sanctification. Instead, we need to look at the real way we are saved.
"For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— 9 not by works, so that no one can boast. 10 For we are God’s handiwork,created in Christ Jesus to do good works, which God prepared in advance for us to do." Eph. 2:8-10
The above verses clearly define how we are saved - by grace through faith. This does not come from ourselves. And neither does obedience. It is a work of the Holy Spirit. There are no works we can do to be saved. However, once we are saved, God gives us works to do. He has created these tasks in advance, to help us grow and mature. And to be on mission with God.
You need to get a better understanding of how we are saved. Study some soteriology, and that will help you, understand the process of salvation. But be careful, there are different views on how we are saved, and it can be a very divisive issue.