What should I write...

I'm afraid I've not come across Harun Yahya - though I presume others here are familiar with him. Is there a particular approach he advocates? From the OP I guess he has things to say regarding human evolution, if so I would concentrate on that aspect. I always find that a well focussed in depth discussion of a narrow field is more interesting than a fairly superficial treatment of a wider field. Remember, most of the readers of the journal are likely to be very familiar with the general subject, with a more focussed article you're more likely to write something the readers are less familiar with - if not actually new.