Hi bearmaster,
Jesus' death on the cross that was followed by the killing of countless other believers by crucifixion may also be seen as a spiritual attack, but even then, Gods will was not hindered.
Ephesians 6 says," For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this age, against spiritual hosts of wickedness in the heavenly places. Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand."
Ephesians goes on to describe the various armor, which is the gospel of Jesus Christ.
Jesus said that He is the vine and we are the branches, if we remain in him, he will be in us. We also know that satan cannot touch Christ. Therefore, let us continue to abide in Christ by humbling ourselves under the mighty hand of our Father, resisting the devil so that he will flee from us.
Even under the old covenant, in Numbers 22:11 when Balaam went to curse Israel, God said “... you shall not curse the people, for they are blessed.”
None can curse what God has blessed.
God says in Isaiah 54:1
15:14-
" Indeed they shall surely assemble, but not because of Me.
Whoever assembles against you shall fall for your sake.
Behold, I have created the blacksmith
Who blows the coals in the fire,
Who brings forth an instrument for his work;
And I have created the spoiler to destroy.
No weapon formed against you shall prosper,
And every tongue which rises against you in judgment
You shall condemn.
This is the heritage of the servants of the Lord,
And their righteousness is from Me,”
and in Ephesians 1:
18 "I pray that your hearts will be flooded with light so that you can understand the confident hope he has given to those he called—his holy people who are his rich and glorious inheritance and what is the exceeding greatness of His power toward us who believe, according to the working of His mighty power which He worked in Christ when He raised Him from the dead and seated Him at His right hand in the heavenly places, far above all principality and power and might and dominion, and every name that is named, not only in this age but also in that which is to come.
And He put all things under His feet, and gave Him to be head over all things to the church, which is His body, the fullness of Him who fills all in all."
I conclude that nothing can come upon us that God has no control over. The enemy may strike, but even God can and will use it as a tool for our good if we continue to humble ourselves before him and remain in Christ. Then He may heal our bodies, He may heal our wills, He may use it to draw others, but He will always use it for the good of those who love Hm and who are called according to His purposes and always for His own glory.