Is Islam against the worship of God's Deity form? If so, why? Doesn't God reveal Himself according to time, place, and people's desire to know Him?
by Laxmimoni dasi
As you said, God arranges for His worship according to the level of spiritual understanding of the worshiper. Actually the Deity appears to us because of Krishna's kindness so that we can engage our natural propensity to serve a loved one with nice material things - jewelry, silk, nice flowers/scents, good food, music and dance – because by using these things in the service of God we can become purified of material desire.
If one is afraid of a personal relationship with God or perceives Him as one without a form, just an energy, then what does he need the Archa Vigraha (worshipable form of God) for? He can simply think of a formless God. But then it is more likely that such a person will simply use material things for his own sense pleasure and fall down from his spiritual practices. But Krishna is so kind to His devotees, who know that He is a loving person, that He offers them opportunities to render personal loving service to Him by coming in His Deity form.