How's it an " assault"?
Of course salvation is conditional on our response to God's grace.
Our response, of course is important.
Salvation is of and by faith according to God's grace. For by grace you have been saved.
Faith comes through Christ to us as a gift
Acts 3:16
NKJV
And His name, through faith in His name, has made this man strong, whom you see and know. Yes,
the faith which comes through Him has given him this perfect soundness in the presence of you all.
NIV
By faith in the name of Jesus, this man whom you see and know was made strong. It is Jesus’ name and
the faith that comes through him that has completely healed him, as you can all see.
KJV
And his name through faith in his name hath made this man strong, whom ye see and know: yea,
the faith which is by him hath given him this perfect soundness in the presence of you all.
Hebrews 12:2
looking unto
Jesus, the author and finisher of our faith, who for the joy that was set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God.