:salamext:
atheists dont know who caused the big bang, if you asked them what caused it - they will say 'i dont know.'
therefore they base they're belief on doubt and they have no answer to that question. We say an All Powerful, Knowing God caused it. This is a better belief than having no answer or belief at all.
Islamic view on Big Bang?
http://dawahtips.blogspot.com/
http://www.islam-guide.com/frm-ch1-1-c.htm
i wont be able to reply now but that might be something to reflect on and maybe even argue.
If they ask who created God - tell them we take Allah as a God because He is uncreated. If he was created He would not be God, and therefore we would not take him as a deity/god - He is perfect and this can be seen in His Names and Attributes - this is why we take Him as our Lord, since His Perfection shows His Lordship over imperfect humans who are dependant. This is our belief, and it is a much more convincing belief than doubt (of the atheists) who have no answer.
Because we cannot see God, it doesn't mean that he doesn't exist. 'Absence of proof is not proof of absence' - as the debate argument goes. There can be someone behind a door and although you can't see him, it isn't proof that he isn't there.
We cannot see emotions physically, but we see their product; tears, smile etc. The hormones in our body (which are physical) cause us to get these feelings, however the feelings cannot be physically seen except through their product i.e. tears, laugh etc. The feelings can only be felt by a person themself, same way with their relationship and belief in God.
And Allah knows best.