Do we believe that we have a purpose? I do. Because like a machine, I know I have a Designer and the Designer has a purpose in mind when He created me. Only then meaning and purpose are not arbitrary, they have a Source. And only then we could have a purpose and meaning.
One might argue that it is my wishful thinking and desire for purpose that lead me to believe there is a Designer. In response, I must ask, what's the alternative? The alternative is that there is no purpose and meaning to our existence. Is that what we experience in our daily lives? Without a Designer, there will also be either no values like good and evil or these values are mere human constructs. In other words, killing a baby is as desirable as nurturing one. Is that so?
For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse.(Romans 1:20 ESV)