Fearing God is a very deep respect that we Christians have for God. It is in some ways "fear" as we know it today but it's mostly a respect for his ultimate power. Many people have a different idea of who God is then the Bible actually teaches. He is a loving and forgiving God as people often dwell on but He also is the same God that destroyed Sodem and Gomorra and instructed the Israelites to kill every man in Canaan, The most important thing to remember is God sacrificed His own son for you ! And that among so many other things is why we should respect (fear)Him
A way religions use to keep people in line. If you read the bible God loves everyone. With that being said if you totally go against his teachings, come judgment day things could get ugly. But if you try your best to be a good person you should be fine.
The beginning of wisdom. Proverbs 9:10 Fear, in this context, is healthy respect. One respects the policeman in the car behind you, so you do not speed. One respects the patrol cop who has the power to pull you over for drunk driving, so even when he's not visible, you moderate your drinking. It is like this with the fear of God: you live your life as if the maker of our soul, the author of your life, has complete power over how the story turns out.
For the unbeliever, the fear of God is the fear of the judgment of God and eternal death, which is eternal separation from God.for the believer, includes understanding how much God hates sin and fearing His judgment on sin—even in the life of a believer
The fear of God is healthful; it is an awe and a profound reverence for the Creator and a wholesome dread of displeasing him. This fear of incurring his displeasure is a result of appreciation of his loving-kindness and goodness together with the realization that he is the Supreme Judge and the Almighty, who has the power to inflict punishment or death upon those who disobey him.
I think Ecclesiastes 12:13 sums it up best when it says, "The conclusion of the matter, everything having been heard, is: Fear the true God and keep his commandments. For this is the whole obligation of man." It's not a morbid fear of God, but a reverential fear. Similar to how you have a respect for heights and gravity. You're not terrified of it, but at the same time you know that if not respected, you can be seriously injured or even die. The fear of God is a respect for his power.
The Bible tells us that we should both love God (Luke 10:27) and fear him. (1 Pet. 2:17; Prov. 1:7; 2:1-5; 16:6) Wholesome fear of God will make us very careful to avoid incurring his displeasure. Our love for God will move us to want to do the things that are pleasing to him, to express our appreciation for the countless expressions of his love and undeserved kindness.
Take this illustration: A son properly fears to displease his father, but appreciation for all that his father does for him should also move the son to express genuine love for his father. A scuba diver may say that he loves the sea, but a wholesome fear of it causes him to realize that there are certain things that he should avoid doing. Similarly, our love for God should be coupled with a wholesome fear of doing anything that will incur his displeasure.
Fear as in respect. The analogy i use are the police. As normal law abiding citizens we are not afraid of the police but we respect or 'fear' the fact they can give us a ticket or arrest us if we do break the law. We arent 'afraid' of the police but we 'fear' or respect the power and authority they have. We are not 'afraid' of God but we 'fear' or respect the ultimate power and authority He has over the world and over us.