I am writing this hub from the point of view of the Christian religion. You should understand that there are many religions and an equal number of viewpoints on many levels about this question. Those who believe that belief in God is optional are really saying that there is no God. From my perspective there is only one God who is the Supreme Being of the universe. If God is the supreme being of the universe then belief in Him  is NOT optional. Therefore, it is important to understand what this supreme being wants from the human race and following the guidelines. We get this information from the Bible.

Most people live basically good lives. They are law abiding, productive members of society. All these are good attributes. As humans we compare ourselves to other human beings. According to this benchmark you or I might be considered a good person. However, when God looks at you or me, He sees a person who was born with a sinful nature that keeps us out of his presence.

Mark 10:18 “Why do you call me good?" Jesus answered. "No one is good—except God alone.

Psalms 51: 5 Surely I was sinful at birth, sinful from the time my mother conceived me.

There is only one atonement for sin and that is a blood sacrifice. See Leviticus 29 in the Old Testament. Jesus Christ introduced a better way.

Romans 4:24 but also for us, to whom God will credit righteousness—for us who believe in him who raised Jesus our Lord from the dead. 25 He was delivered over to death for our sins and was raised to life for our justification.

John 3: 5 Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. 6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.

So the only way to be assured about your future in the afterlife is to be born again of the water and the spirit just as Jesus told Nicodemus two millennia ago.

I would like to comment on the idea that is constantly put forth by unbelievers that Christianity is bad or evil because bad things have been done in the name of Christianity.  Just because some Christians do bad things does not mean that all Christians are inherently bad.

Many people hate our former president, George H. W. Bush and say that he was responsible for many bad things in this country and around the world. President Bush is an American. Would you say that all Americans are evil and intent on domination of the world? I don’t think so. You can apply this formula to any group of people you choose.

We are constantly being told that all Muslims are not like the terrorists or jihadists. Yet fringe Islamic groups perpetuate evil and destruction around the world. Stereotyping a group of people based on the actions of some of these people is foolish in the extreme.

In the end only you can decide what you believe. If you are truly right believing that there is no God you have nothing to worry about. When you die your soul will cease to exist as will mine. However, if you are not right in your choice then I will be in the Presence of the Lord and you will be in a very hot place. All this is the result of the free will choice given both of us by God.

So my answer to your question is, “No. It is not enough just to be a good person. “