Many muslims make the comment that without islam where does one draw morality from? This is a foolish question since the so called morality in the quran is not so moral. For example-
Islam promotes male promiscuity
islam forces women into subjugation and inferiority
Islam asserts women are intellectually inferior, islam forces that women must be taken care of by men due to their weakness- this is highly foolish considering that men, as a whole, are not magnanimous and caring beings
islam blames women for rape and removes accountability for men asserting that any woman who allows herself to be seen is just asking for rape!
Isalm permits child (female) marriage and sex with pre pubescent girls- the penalty for fucking a child and damaging her is that the male must take care of her financially though she's not regarded as one of his 4 allowed wives! How abhorrant!
Islam permits slavery- POWs
Islam permits rape- sex with slaves!
Religion is man made, this is something you have come to realise, yet you are confused how humans can be moral without islam, when the so called morals of islam are man made- this is illogical
Morality is flexible- it changes as understanding increases, as humans develop.
Morality is not black and white. Promiscuity was once dangerous due to STDs, but with the advance of science we can avoid this with adequate protection. Sexual monogamy can lead to a bond, an affinity with a special someone which many prefer, but some people are quite happy being promiscuous and also having open relationships. In this regard some aspects of morality are more personal preferance than absolute truths
Murder, theft, rape, paedophilia- these are all acts that affect another. These acts cause harm or loss to another. This is why they are wrong. You can choose what you wish for yourself but you have no right to affect others who don't choose what you choose.
I was thinking about poverty today after I saw an ad telling me to 'save the children'- this ad urges donations so 'no child has to die'- it made me think- what would happen if we did in fact save all the children and fed all the starving people etc? The result would be illogical- the earth can only sustain a certain number of individuals. in the animal kingdom a species will flourish then there will come a point where there aren't enough resources to support them all so some will die from starvation. Over crowding also increases infections so some will die- in this way over time equilibrium will be achieved. So in a way saving people seems rather foolish, but on the other hand the reason people are starving is because some of us humans want too much, waste food, dominate, etc- basically we take more than what we need. In this way it seems right to give a little back.
Anyway, what I'm trying to illustrate is that morality is a fallacy, there is no absolute right or wrong. In the case of starving people the logical thing to do would be to limit birth worldwide by means of contraception and/or abortion- allowing people to breed freely is inevitably going to lead to poverty and starvation. Yet doing this would be regarded as immoral as it removes the rights of people to breed. This sort of argument can be applied to almost any aspect of morality.
I believe it's important to put aside worldwide issues and instead think of your own personal morality- what is good for you that doesn't harm others- so no murder/rape/paedophilia

Will you be happy drinking excessively, doing drugs, partying all night every night? Will this lead to a good future? Can you hold down a job/get an education with this sort of behaviour?
Are you happy sleeping around? Will you be able to connect with anyone this way? If you find a person you do connect with and wish to continue sleeping around (open relationship) will you be happy to know your partner does the same? When you love someone you don't want them to be intimate with another for various reasons, so is it fair that you allow yourself this and not your partner?