can there be meaning in life without god? No!
Only God Can Provide Meaning
The Issue: Without God, we are an accidental byproduct of nature. Death is all we can look forward to, and whatever we gain in life will be gone, with no memory of it in the end. The whole universe will eventually collapse upon itself, and everything that exists will be dead, ruined, and with nothing or no one to care what ever happened in our comparatively short period of existence. Compared to the infinite lengths of time that will exist after the death of our universe, our existence becomes insignificant and ultimately meaningless, because we will end in nothing.
But Think About It: If nothing exists after the universe is gone, then what we do during our life has no ultimate meaning. Objective values can only exist if they survive after everything is dead and gone.
If nothing exists after the universe is gone, then there is no ultimate purpose of our lives. The accidents of chance are all that exist, having arrived with no reason, and with nothing to show for itself after it is gone. No one will remember, no one will care.
If nothing exists after the universe is gone, then there is no ultimate value. All things can be permitted, and there is no right or wrong. We have seen how this is an un-livable condition, since we all live as if we have a right or wrong, even if we (vainly) try to develop their definition ourselves. No evil acts will be punished, no good acts will be rewarded. Anything accomplished in this life will be left for nothing, in the end when everything is waste.
Talk about the ultimate 'waste of time'! Yet, these thoughts have driven the concerns of man since the beginning of time. It fuels what has been called our 'religious impulse'. People in all ages, in all nations, in all races, have feared this inevitable doom, and have pursued a meaning that is beyond themselves. But we all desire our lives to be purposeful, to have meaning. We want to know what is right and wrong, and know how to live our lives. How can we resolve this issue? How can we continue to have a will to live - to live a life that enables meaning, purpose, and value?
The Resolution: In order to have ultimate meaning, there must be life after our current existence. Something must exist beyond nature. In order to have purpose to our current life, there must be something that remains after all is dead and passed. What is the common definition of this condition? Immortality.
By definition, God is that which is beyond nature, and that which created everything for it's own purpose (this is the most basic definition of God.) With God, we have a creation that has a purpose (the Glory of God), mankind that has value and meaning (made in the image of God, created for fellowship with God). With God, we have 'Truth', meaning and objective guideline: Objective right and wrong, which will allow us to determine what is good or evil.
There is no consistent alternative. If God does not exist than anything goes. Nihilism is the inevitable result; anything else is an inconsistent lie.
Beware The Ignorance - The ultimate mistake is to ignore this issue. Postmodernism (Relativism) is a description of the condition where people choose to develop their own personal value and morality. We choose to not think about it - we choose instead to believe that we have meaning in our own time, and that our own purposes will satisfy our needs. But this is but a placebo - it makes us feel better, but is totally ineffective in describing or determining ultimate value. What we do to keep from going crazy is ignoring the issue. We lose ourselves in 'escape' (Craig). This is the Ultimate Condition of Denial. Most other religious worldviews are designed by man to solve the human condition and ease the pain of the religious impulse. But there can only be one truth. This argument does not prove the case for Christianity, but it does lead us to investigate and look for God, and His meaning and purpose.
Summary - If God does not exist, then life is futile. If God does exist, then life has meaning. Atheism is impractical, as it is un-livable and un-bearable. It is reasonable, therefore, to believe in God, and by further extension, Christianity. For Christianity is the only consistent 'religion', and the only worldview with the power of reconciliation with the Creator.