Will God protect someone who keeps on sinning?

God protection is evident from the creation of the world. If we look from the aspects of science, we will see that God has been protecting us from the creation of the world. God put the ozone layer on planet earth to protect us from the harm of the sun. If the sun is to shine directly to the earth without the protection of God ( ozone layer ) on plant earth, we would all be harm. The earth is protected by the earth atmosphere. There are other planets without a protective atmosphere like the earth.

God is protecting all of us even the notorious criminals are been protected by God. God is protecting us physically and spiritually. The earth is the only planet with existing beings like us according to Act 17:26

Acts 17:26 And hath made of one blood all nations of men for to dwell on all the face of the earth, and hath determined the times before appointed, and the bounds of their habitation;

Humans are only created to live on earth. God has placed here for us to dwell and it's all God's plans.

Is God protecting us? Yes

God is protecting the righteous and the sinner. He protecting from the evil spirits.

Psalms 34:7 The angel of the LORD encampeth round about them that fear him, and delivereth them.

St. Matthew 5:45 That ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust.

There is special protection offered by God for those who will obey Him. For instance, we are protected from the corruption of the world by the teaching of the Lord. It is through the teaching of our Lord Jesus we make escape the pollutions of the world.

Psalms 127:1 Except the LORD build the house, they labour in vain that build it: except the LORD keep the city, the watchman waketh but in vain.

2 Peter 2:20 For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.

Some special people are protected in a special way God, these are people of God. Even God has appointed overseas over the people God through the Holy Spirit to the church of God.

Acts 20:28 Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood.