Hello and welcome to CF.
it is good that you read "other passages" and so ask what it means to be a Christian ("little Christ" ... i.e. like Christ). People sometimes try to distill "salvation" into the simplest means possible - often taking one verse and treating it as though it is the summation of all it means to be Christian. If that were the process we were meant to use, we wouldn't need the whole of the New Testament, would we?
After all "even the demons believe ... and tremble". Yet we do not call them "saved". And their belief (mental assent) is greater than ours, because ours is based on faith, but they know Who Christ is.
Several earlier in the thread have well-said that if we believe, we will follow. After all, faith without works is dead.
The big debate comes in because sometimes people are afraid that by saying this, we might be thinking that our "good works" somehow "save" us, as if we are "purchasing" our salvation with our works. Of course this is impossible.
But as a man acts, so he is. If we begin to give to others, we can become a generous person. If we begin to think less of ourselves, we can become a humble person. If we begin helping others, we can become a helpful person. And if we apply ourselves to loving others, we become a loving person.
No one particular act is "necessary" as we are living our lives in Christ - "working out our salvation in fear and trembling". But the way we live our lives shapes who we become - and we are expected to become like Christ.
So ideally, our thoughts, words, actions, and attitudes should serve to make us continually more and more like Christ (along with the grace of God, which is also necessary - in ourselves we can do nothing).
It all goes together and points to the way of Life - which should be our entire lives. We are being transformed from glory to glory into the likeness of Christ, being restored to God's initial plan for us at creation.
And we have however long God grants for the rest of each of our lives to carry that out.
