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There are people who do not have faith and belief in HIM, in spite of all riches and higher status of life. They do not do any ritual and worship and believe in their own intelligence and power of wealth. The answer to this state of mind is that at the present time they have stored large number of good deeds in the past lives and thus getting the fruits of it.
When they continue to behave in good manner without any ill for anybody, time will come when they will turn towards HIM automatically. This may come with some incident or accident when they will realize that there intelligence and wealth is of no help to solve their acute problem and no ordinary person in this world can help them. Then they will turn toward s HIM and pray for HIS help and on getting HIS help their faith and belief will start building slowly.
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Well Quran says that if your intention is true and you really want to get to God, He will surely guide you to HIM. And It is HIm who guides and no human being can convince you by logic or argument. So we pray that our intention be pure and HE guides us to Him and show us the path which leads to HIm. (AMEN)
There might be people who would not take faith on face value alone and would like some argument to believe in a Him.
For example, all photographs clicked by a normal camera will show all black and when a night vision camera is used it shows all the objects in front of it.
Thus, one have to have some intellect and understanding to study some specific area of knowledge. A Professor in Physics can not do any research in the deep field of pure Zoology.