I could agree if you said little faith. Weak faith! No such thing. Where does faith come from—God. He doesn't hand out weak faith.
When I say 'weak faith', I mean 'weak believing'.
Faith is a noun. It's the ability to know something you can't see is true. It's a conviction.
Believing (trusting) is a verb. It's what
you do in response to the ability to know something is true (faith, see above) that God has given you.
He gave you the power of faith so
you can then place your trust in Christ and be justified and saved.
You are spot on when you said salvation is apart from works. But God will bring us separate rewards for our works.
Matt. 25:28, 29 "Take therefore the talent from him, and give it unto him which hath ten talents. For unto every one that hath shall be given, and he shall have abundance: but from him that hath not shall be taken away even that which he hath."
Matt. 25:21 "His lord said unto him, Well done, thou good and faithful servant: thou hast been faithful over a few things, I will make thee ruler over many things: enter thou into the joy of thy lord."
Mark 9:41 "For whosoever shall give you a cup of water to drink in my name, because ye belong to Christ, verily I say unto you, he shall not lose his reward."
There are works of sacrifice and service that the believer has, and there are works of obedience.
Obedience is better than sacrifice.
This is best illustrated in how people in the church will be diligent to serve in the church in various works of service and sacrifice, but in their personal lives they have little to no obedience to the commands of God on how to live and how to treat people. 1 Corinthians 3:8-15 is about works of service performed in the building and field of God's people, his temple. Not about a person's individual acts of obedience and how they live their personal lives.