Many people believe in the Body of Christ that God saves us, but then it all falls back onto us to stay in Him.
Yet Jesus declared plainly God's will for us: "to lose nothing, and raise it up again."
First of all this, resurrection speaks of Jesus.
"For thou wilt not leave my soul in hell; neither wilt thou suffer thine Holy One to see corruption." (Psalm 16: 10)
God the Father certainly did not leave Jesus in hell, but resurrected him, a signal of our justification before God in Christ (Romans 4: 20), then seated His Son at His right hand:
"And what is the exceeding greatness of his power to us-ward who believe, according to the working of his mighty power, 20Which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly places, 21Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come:" (Ephesians 1:19-21)
Today, everyone who believes on Jesus is saved from the wrath to come and receives eternal life:
"And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption." (Ephesians 4: 30)
"I give them eternal life, and they shall never perish; no one will snatch them out of my hand." (John 10: 28)
It is God's Will to keep us forever in Himself. We do not have to worry about trying to keep ourselves in Him.