We've all left stuff out there friend. We can't post the entirety of Scripture in each post.
He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.
Yes, it is necessary to believe. Nobody argues against that. But when you look at the rest of Scripture, it isn't just believing in isolation. You must also be doing the will of God.
Faith with no action, including charity, is dead as specified in many of the Scriptures you left out friend. So anyone who cries out "Lord, Lord" but does not pray and live piously and charitably (i.e. does not do the will of His Father in Heaven) will be condemned.
Faith of itself, if it does not have good works, is dead. Scripture can't be any clearer. The only time you find the words faith and alone next to each other, the word "not" is in front.
So you believe what you want. Go ahead and trust in your good works to save you - because salvation can only be by grace OR works. Faith that does not bear fruit is indeed dead - unfruitful. True faith will bear fruit because it is its nature to do so, not so it may become true faith.
John 6:27-29
27Labour not for the meat which perisheth, but for that meat which endureth unto everlasting life, which the Son of man shall give unto you: for him hath God the Father sealed.
28Then said they unto him, What shall we do, that we might work the works of God?
29Jesus answered and said unto them, This is the work of God, that ye believe on him whom he hath sent.
Our savior's own words. I will trust in him.
Lets give james the credit he deserves
The book of James was written to a converted church , not heathens seeking salvation . It tells them how their conversion is seen by the unsaved world . It is not about becoming saved or being saved. It is about the fruit of your salvation.
Jam 2:17 Even so faith, if it hath not works, is dead, being alone. a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works.
This is an amplification of the teaching of Jesus that we know a tree by the fruit it bears. It is how we know the saved from the unsaved. It does not declare that the man has faith ...but that he SAYS he has faith.
The will of God is to believe on His Son...
So anyone who cries out "Lord, Lord" but does not pray and live piously and charitably (i.e. does not do the will of His Father in Heaven) will be condemned.
Jesus says that if we repent and turn to Jesus, we are no longer in condemnation...I believe Jesus...
You nor your religion are afforded that privilege to judge other people...We are instructed in the scripture to be holy and have love, which includes charity but we, when we judge, judge the outward appearance...God judges the heart...