Is Will Power Necessary to Have Victory Over Sin?

It's total submission to God that is necessary rather than will power. Your will "power" needs to be in your willingness to totally submit to God (James 4:7-8). 

Your attitude as you approach God is very important and will determine what kind of result you get. The real power to live the life that is pleasing to God will be given to you by the grace of God (Titus 2:11-14). It's when you are humble before God and weak in your own eyes that you will cry out for his deliverance and then He will make you strong by his power (e.g. 2 Corinthians 12:9). You have to take your "self" out of the way to follow Jesus. He said it like this: "If anyone wants to come after me, he must deny himself and take up his cross daily and follow me" (Luke 9:23). Not many are willing to do that. And that's why not many are getting any practical results out of their faith. 

False teachings do not lead people to follow God's precepts. Thus, many want to wave a magic wand rather than approach God the way He has prescribed (e.g. James 1:21-22), being willing to repent genuinely and stop living for themselves (Romans 6:4-11, 2 Corinthians 5:15). One of those false teachings is to "trust" in a particular result of having faith in God while doing nothing and believing that Jesus did it all (video). It's very popular. "But why do you call me ‘Lord, Lord,’ and do not do the things which I say?" (Luke 6:46) would be Jesus' question to those believers who call their faith a conviction that requires them to do nothing. Essentially, they are believing that faith without works (of faith) is not dead (comp. James 2:26,  Galatians 5:6, 1 John 5:3). But they do need to strive to enter through the narrow door (Luke 13:24), and God will energize their dilligent efforts (Philippians 2:12-13).

There is a lot of baggage that may come with the world's idea of "will power." And that's not what the Bible teaches to those who want to follow God's ways. They only have to be "willing" to wholeheartedly obey God in all if they love Him. And if that's will power, that's real power!

See also:
Freedom From Sin

Faith Implies Obedience 

Works Of Faith Are Not Works Of The Law - video

How Do You Love God with All Your Heart, Mind, Soul and Strength?

What does "by grace are you saved through faith" (Ephesians 2:8) really mean?

1 Corinthians 1:27-29
27 But God has chosen the foolish things of the world to put to shame the wise, and God has chosen the weak things of the world to put to shame the things which are mighty; 28 and the base things of the world and the things which are despised God has chosen, and the things which are not, to bring to nothing the things that are, 29 that no flesh should glory in his presence.

Image by Colin Behrens from Pixabay

 

I find this to be quite a thought-provoking image. To the Christian (follower of Jesus) light bulb, I say, "Make sure you stay connected to Jesus, abide in Him (John 15:4-6; 1 John 2:28; 1 John 3:6, 24; 1 John 4:13), and  never unplug yourself from Him through disobedience (1 John 3:6). That's keeping your faith (Galatians 5:6). That way, you will keep on shining as planned (Matthew 5:14-16, Ephesians 5:8-10) —rather than be sinning." And to those who have neither socket, nor wire, nor plug, don't marvel that I tell you, "You must be born again. And you will receive these all at once and pass from darkness to light (Acts 26:18, 2 Corinthians 4:6, Ephesians 5:8)."

Matthew 5:14-16
14 “You are the light of the world. A city that is set on a hill cannot be hidden. 15 Nor do they light a lamp and put it under a basket, but on a lampstand, and it gives light to all who are in the house. 16 Let your light so shine before men, that they may see your good works and glorify your Father in heaven.