Firstly, I'll say that I am not a Christian or a follower of any religion. Nonetheless, I see the humanist wisdom that is passed down through many ancient traditions, such as the Bible. It is as ripe with wisdom as the works of Plato or Aristotle or any of the Western philosophers that follow. It even shares some themes with Eastern traditions (cf. Book of Ecclesiastes). But there is also prejudice and propaganda in all those works. I would be a fool to claim, absolutely, to know the right from the wrong. Or, in the Bible's own poetic words, to separate the wheat from the chaff.

I offer this passage from Isaiah 45:9-11. First, the King James Version, which is rather poetic:

Woe unto him that striveth with his Maker!
Let the potsherd strive with the potsherds of the earth.
Shall the clay say to him that fashioneth it, What makest thou? or thy work, He hath no hands?
Woe unto him that saith unto his father, What begettest thou? or to the woman, What hast thou brought forth?
Thus saith the LORD, the Holy One of Israel, and his Maker,
Ask me of things to come concerning my sons, and concerning the work of my hands command ye me.
Now, the same passage from a different translation which is less poetic but more understandable, the International Standard Version:

Woe to the one who quarrels with his makers,
a mere potsherd with the potsherds of the earth!
Woe to the one who says to the one forming him,
‘What are you making?’
or ‘Your work has no human hands?’!
Woe to the one who says to his father,
‘What are you begetting?’
or to a woman, ‘To what are you giving birth?’!”
his is what the Lord says,
the Creator of the signs:
“Question me about my children?
Or give me orders about the work of my hands?
This metaphor of the clay and the potter recurs a few times in the Bible. Basically, it means that it is futile to question or reason about the works of God because we can't possible know the purpose. And any attempt to rationalize our logic about God's reason is equally dubious. Now, this is very important: it is futile but not wrong. "Futile" means there is no satisfactory end. If you keep asking, you will not find an absolute answer. You will only find and dwell on the same circular conclusions that other humans have arrived at for millennia. Nonetheless, you might find purpose in the process of questioning.

Connecting back to the topic, I think each person finds purpose in their own way. The "finding" is the most important part. They do so by asking questions. Their questions might be inspired (or manipulated) but their context and upbringing. Ultimately, those questions may lead nowhere. So what? Humans have been doing it for millennia. Plato and Aristotle did it. So did the apostles and Thomas Aquinas and every Pope since Peter. Also, Descartes and Hegel, Kierkegaard, Nietzsche, and Camus. And probably Charlemagne, Napoleon, Newton, Marx, Freud, and Darwin too.