Well I'm seeking to hear the perspective of the scientific community and keeping religion out of this, so here I go...
1.) Is there a reason we exist?
2.) Is there something we're supposed to strive for or is this just what it is?
3.) Why is this what it is? Why do we exist?
1) What would a reasonable reason be like? Tell me an example of such a reason, in your mind. Or better yet, tell me two plausible reasons. I ask this because I would like to know what exactly would be considered a "reason for existence", other than a religious one. (Like god made us so that we will worship him.)
2) Supposed by whom?
3) Why not? (Again, the "we" is loaded. What makes you think there is a single reason for everybody's existence? By we do you only mean you and me, or humans, or bacteria and viruses and planets as well?)
To be fair, he did not ask about beliefs at all.Science does not deal with beliefs and useless scholastic. Thats left for philosophers.
Scientific method - Wikipedia, the free encyclopedia
And no, nothing should be left merely to "philosophers" - why would a non-scientist philosopher know anything more than a scientist?