My Dear Mike:
Some people believe that seeing (what is already visible) is believing and some people ask Allah to send some other proof (from the invisible world) for them to see and then they will believe. Allah will hear one’s prayer and will answer it too. No one knows when the answer will come except Allah. The key is to never give up believing in one self and one's deepest inner knowledge that there must be a cause for one's existence (that some intelligent living entity must exist greater than what one sees in one self and even greater than the things that surrounds one (for all things that surround us are made of the same matter but of varying combinations of substances etc.) Once the question is presented to Allah (however one has asked it the same way it shall be answered: i.e. the intensity of the desire to know is instrumental in the intensity of the answer). If One can or dose not fear the devil (and only fears breaking the Laws and when one breaks the Laws one is remorseful and continues to be remorseful and repents at every offence (no matter how little of an offence) silently or privately to Allah then Allah knows that this person is ready to see more of what they ask for. (But one must be careful what one asks for and under what condition of mind what one asks for to see. If the condition is anger then one will see of the angers of the invisible world and if the conditions are peaceful then one will be shown of the peaceful and angers of the invisible worlds. So the more at peace one is with oneself (that is with less guilt the more they will see of the different aspects of the invisible world) Allah answers all sincere questions; even secret knowledge which is given to those who invent and/or discover scientific formulas for explaining a mystery which may have puzzled mankind. (One has to always remember that the devil will always be there to steel that knowledge and Allah permits this as a test for both the devil and the individual who the devil will offer to be partners with before the knowledge is given. This is permitted to take place because nothing can hurt Allah and Allah already knows what will happen because no one get this knowledge except those who are sincere and will not put it to use for the sake of Greed. The knowledge is never sold by the recipient; it is shared freely and if it is misused by others then the miscreants always end up paying the price and their victims are with Allah.
As Ever humble