- If you were a teen with raging hormones and had no clue about social and personal negative implications of unregulated sex, naturally your reaction would be to be put off about Islam that tells you to exercise self control and pay your dues before you have sex first. There is dignity to a regulated sex through social and religious norms. It doesn't take faith for a guy to know his wife should only be his for example. Or his girlfriend should only be his. In the name of sex, and for the sake of satisfying desires, an atheist would object to sex with anyone by his wife. Examples to hihglight why it is important to regulate sex in humans are too many to count. The absence of such norms would result in social and personal issues.
- Same goes for pork, alcohol. drugs etc. Whilst the reasons for their banning may not be obvious to the uneducated and uninformed, there is plenty of data of why these are counter productive for humans. If you were a nomad somewhere in Somalia, and you needed to know the reasons scientifically, you couldn't. Imagine then and there you left Islam because the answers you were seeking were not available whilst you were tending to your herds? Would that make sense to you really?
Islam directs muslims and others to take their questions to people with Knowledge. Allah does not expect human beings to know every answer. Also, in Islam, some reasons are not clarified simply because they are not necessary for faith.
Others can add to what I said above and correct me if I am wrong from the brothers reading here.