Response to Vlad's Post 3:
Some think we can conceptualise something popping out of nothing but then again how would we know it didn't beam in from somewhere.
All I can say about nothing is that it is the absence of something. I find it impossible to conceptualise nothing, I can only conceptualise something.
If we say something's been around for ever then that poses problems for science since it cannot be observed or measured.
One idea is that the universe goes through a continuous process of expansion and contraction. In theory, this could be ascertained and measured. I can't see why it would be a problem for science at all, especially as it has been proposed by scientists.
So popping out of nothing or being eternal are non natural events.
Assuming by 'natural' events you mean those that are investigable by science, why would you come to that conclusion? If either were true, why couldn't they be natural events/states which science has not yet discovered?
If you argue that something is eternal you give up your right to criticise someone else for believing that something is eternal.
Well that's obvious isn't it! However even if I believed that something is 'eternal' it would depend upon the exact nature of the 'eternal' that is proposed by this 'someone else'. Hence, I would reserve the right to criticise about the nature of this 'eternity'.