Hebrews 11:6: But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him (KJV).
God was happy when He created the world. He was pleased with everything that He made and found it was good. For us to please Him, we should have faith. Faith is the substance of things hoped for. Everytime we come to God, we must believe that He will do what He has promised and that He lives. He rewards everyone who seek Him diligently.
If we have faith as small as a mustard seed and when we go to God, He sees it and is pleased. He does not require us to have a mountain like faith. He will be more than pleased if there is just this mustard seed faith. That is it. That is all that is required to win His favor. Sometimes we fight the battle on our own thinking that we can do it by ourselves. We lock God up in heaven and try to fight the enemy and fail. God wants us to go to Him in faith that He will move the mountains for us. When God sees that we are trusting Him for everything, He will reward us with victories. We have to have faith in Him as well as believe that He is God and will do what we ask in His name.
God never turns down anyone who goes to Him with faith. It is impossible to please Him otherwise. Believe that He is able and mighty to answer your requests.