It is a very valid question.
Yes it is a valid question. I didn't understand it is all
If god does not tell you "this is moral" then how do you decide its moral??
1)We have been given something called Fitrah.
[PIE]Fitrah: Inborn Natural Predisposition
Yasien Mohamed
In attempting a definition of ‘fitrâh’, I give an exposition of its linguistic and religious meaning. The religious understanding of fitrah is based on the positive interpretation of fitrah…
Suffice it to say that linguistic and positive religious explanations have one thing in common: both define fitrah as an inborn natural predisposition which cannot change, and which exists at birth in all human beings. What makes our religious understanding positive is that it not only acknowledges fitrah as a natural predisposition, but also one which is inclined towards right action and submission to Allâh, the One God.
After discussing the implications for human responsibility, I compare, for the benefit of Western readers, the Islamic concept of original goodness with the Christian concept of original sin. I argue that the doctrine of original sin, from an Islâmic point of view, cannot be reconciled with the notion of Divine mercy nor the human responsibility. Since the doctrine of original sin features significantly in the Christian concept of human nature, and as Islâm and Christianity are the world’s largest revealed religions, this aspect of their creeds presents an interesting contrast, well worth investigating.
[/PIE]
2) We have to reason and use Logic. If for example something is wrong with your PS3, the person who can best diagnose the Problem and provide a sollution is the peson who made the PS3. Therefore God, Our creator, is the best source for sollutions to our problems when it come to all issues. If we didn't have revelations it would be a different story but since we have these revelations we should consider it.
3) If what's Moral and Immoral is left to every individual then the frictions caused due to Moral misconduct would be ceaseless as it is today.
For example:
We have Islamic nations where they know the Laws of God and do not enforce it fully, putting in their own self made Laws. And we have the Western Nations who sincerely want to help an Individual but are enforcing man made Laws, but due to their sincerety the Victim finds some Solace.
In both cases we have Injustice which doesn't help stop the problem or from producing further victims.
And before you read the books were you immoral??
If not where did these morals come from?
It came from Fitrah and also from the preservation of what was learnt from the Prophets that were sent to every nation from the time of the first man Adam(AS) to the time of Mohammad(SAW). And Mohammad(SAW) finalised it for us.