OK, lets try to explain this. God gave us free will. So much of the suffering comes because of us humans we commit the suffering or sit by and let it happen. God does intervine all the time. The sick are healed , the blind can see and the lame walk. Why not all prayers answered? Because God only hears the prayers of His children (as pointed out in scripture). If you do not know God He will not hear (listen too) your prayers. Also, when a Christians prays it must be according to Gods will. So we can't pray for 1 million dollars and expect to recieve it. UNLESS it is Gods will.
When people are healed, it's from taking medicine and their bodies heal themselves. If that was true, wouldn't more faithful people heal quicker than full blown athiests? No, we all heal at the same pace. And since when does God cure people of blindness and paralysis? If he did, not a single person today would have these predicaments.