The need for love and God is pretty broad, I'm afraid, so we're all just giving you some ideas which may or may not be suitable to your specific assignment. Since you posted it in the literature section, I'm guessing you'll need to support your position through literature. You aren't likely to find many works which will specifically address God as the answer to man's sinfulness, but there are plenty of works which will demonstrate the need for God in a world full of sinfulness. I'm thinking of A Tale of Two Cities, which highlights both the depravity of man through a variety of sins and the picture of God's sacrifice for our salvation through the character of Sydney Carton. Perhaps this will work for you.
You would benefit from having a more precise scope for your essay. Is this based in religion, or literature or something else? How you respond to this question will impact greatly what kind of materials/arguments you will refer to to support your thesis. In addition to the excellent suggestions made in #2 you also might find it useful to refer to thinkers such as St. Augustine, who famously said:
Thou hast made us for thyself, and our hearts are restless until they find their rest in thee.
Depending on exactly what your prompt is, you might write about people's need (on a personal level) to feel God's love and/or to receive God's grace. On the second of those, you could talk about the inherent sinfulness of human beings (something that many religious traditions have emphasized). You could then talk about the idea that only God's love allows people to escape the punishment they deserve for their sinfulness (sort of like what Edwards says in "Sinners in the Hands of an Angry God..."
It will depend largely on which side of the argument you are taking...I will offer you a couple of examples.
If you are arguing in your essay that mankind needs love and God, you could point to NIGHT, Schindler's List, The Crucible, Frankenstein, and other works to prove that this is true. From this vantage point, you would argue that without belief in, love for, and strength from God, mankind is devoid of purpose and hope which is especially necessary to survive tragedies as they come along. Tragedies occur to test our faith and to give us strength--to make us lean more heavily on our benevolent God. In the first two examples, the Jews and other victims of the Holocaust (gypsies, homosexuals, the handicapped, Seventh Day Adventists and members of other religions frowned upon by Hitler, etc.) were put in the most horrible situations of their lives. Most leaned on God, some lost their religion to be strengthened again later on. The Crucible was based on a real life witchhunt in Hollywood in the 60's when people were actively seeking "Communists" within our country's borders to crucify. Both the real life victims and the fictional characters in the play suffered from accusations and from trials which made them all seek the love and guidance God offers. In Frankenstein, Victor plays God when he creates his creature, but unlike God, Victor abandons his "child" to eek out his own existence without love, guidance, or protection. Victor definitely needs the love of his family and the love of God, portrayed as closeness to nature. When he neglects his family and nature, he chooses unwisely and strays from the path of righteous living therefore making horrible decisions which have a negative impact on nearly everyone in the novel.
On the other hand, there are many stories in which people claim to "make their own luck" or live their lives without a belief in a Higher Power of any kind. Faustian stories such as The Devil and Tom Walker make the Devil the guiding force and the benefactor of the main characters. These characters do not call upon God or His love to guide them, with the exception of Tom Walker who does carry a Bible around toward the end in the hopes that it will protect him from Satan's power and release him from the contract. Of course, you could argue that this is not truly a belief in God but a desperate last-ditch effort to "win" at the game. Check literature written by atheists, agnostics, and even Humanist literature (humanists, if they believe in God, believe that He made us and left us largely to our own devices. He simply created everything like a huge clock, wound it up, and let it go without any intervention whatsoever).
It all depends on whether one believes in God or not. I personally don't but there is a great need to not actually love one another but to appreciate and understand each other. Would i risk my life for my family? Of course. Would I risk my life for a stranger? I have but not likely any more.
Please write ideas for this essay