What do you mean by 'purpose'? What do you mean by 'life'? What do you mean by 'is'?
The purpose of this thread is clear:
Appopin: <... I posted this topic because of the complaints that there were'nt enough 'meaningful' topics...>
Thought-provoking, controversial, a great topic.
That the thread topic is "What is the purpose of life?" implies that its actual purpose is unknown (and it isn't, if it even has one) and thus opinions are being solicited. Were The Purpose of life known the thread topic might instead have been worded: "Why is the purpose of life what it is"?
The fact there is no consensus on the 'purpose of life', or even that there is a purpose to life, supports the conclusion that any speculation about such a purpose is personal opinion.
What is the purpose for a bacterium's life, or a tree's, or a butterfly's? No one I've heard claims that all of god's cockroaches will be blissfully hanging out with us in heaven.
So, the question really is implying "What is the purpose of human life?"
The easier question of purpose to answer is: the purpose of your life is to make of it what you will.
One can be of the opinion that it is to twiddle your thumbs until the next life comes along, or be of the opinion that the purpose of being in god's test tube while he conducts good vs. evil experiments with us is a stupid premise on which to base life's purpose.
In the absense of certain knowledge of a purpose to life one's conclusions necessarily are based on specultaive conjecture, nothing more.