Fighting against Satan is Believing in Christ Jesus
According to Christianity, Buddhism, Islam, and other non-nonsense traditional religions, there is life after death.
But, you have to also admit that there are Heaven, the hell, etc. And, further, you have to accept existence of the God, angels, Satan, devils, etc.
Based on these notions, you have to love the God and hate Satan. And, if you fight against Satan, you can be a follower of Christ Jesus.
If you simply go to a church, you are just a churchgoer. If you simply read the Bible, you are just a Bible-reader. If you simply revere the Pope, you are just a Catholic. If you simply revere a priest of a Protestant church, you are just a Protestant. But, if you are fighting against Satan, you are truly a follower of Christ Jesus, since the enemy of Christ Jesus must be also your enemy.
Nonetheless, most of people do not revere the Pope or a Protestant priest, believe in Heaven and the hell, or accept the idea of life of after death. And, almost none fights against Satan. So, there are almost no followers of Christ Jesus.
Fighting against Satan is the strong proof that you are a follower of Christ Jesus. Because Satan comes into minds of religious people, religious bodies, or churches, and even into minds of the Pope and other leaders of religions.
So, when you read the Bible, you have to learn how Christ Jesus fought against Satan. When you go to a church, you have to find into whose minds Satan have penetrated. When you live in this life, you have to pray to Christ Jesus and the God to save you infighting against Satan. And, when you start to live life after death, you have to fight with Angels against Satan.
Put extremely, living must be fighting against Satan. According to Christ Jesus, you have to fight with poverty, love, God's authority, etc. against Satan using money, worldly power, temptation to worldly happiness, etc.
It is not so easy. Indeed, how can you fight against Satan while you are suffering from the corona-virus? We only have to ask help from Christ Jesus and the God.
Anyway, fighting against Satan is believing in Christ Jesus.
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Mark 5, King James Version
27 When she had heard of Jesus, came in the press behind, and touched his garment.
28 For she said, If I may touch but his clothes, I shall be whole.
29 And straightway the fountain of her blood was dried up; and she felt in her body that she was healed of that plague.
30 And Jesus, immediately knowing in himself that virtue had gone out of him, turned him about in the press, and said, Who touched my clothes?
31 And his disciples said unto him, Thou seest the multitude thronging thee, and sayest thou, Who touched me?
32 And he looked round about to see her that had done this thing.
33 But the woman fearing and trembling, knowing what was done in her, came and fell down before him, and told him all the truth.
34 And he said unto her, Daughter, thy faith hath made thee whole; go in peace, and be whole of thy plague.