hi...i do understand... because i used to be in your situation before... i understand deeply.... all you need is a logical thinking brain. don't stress yourself... take time.... yes every christian do believe the power of Jesus Christ, because he can make someone alive from dead, cure the blindness, and much more miracles. Same goes to every prophets including Muhammad S.A.W too... But don't forget.... they can show miracles only with the will of God. Their miracle was to tell the people the Almightly of God. And people should accept them as their prophet and the God is one. That's y we never worship a Rasul/prophet. All Rasul/prophets are noble and glorious because they are the chosen one by Allah. Allah wants them to show the truth to human, so that we will worship the right God, nothing else.... Jesus Christ was sent only to the people of Jerusalem. And he asked people to believe in oneness of God. When the time has come, Allah sent the last messenger to the world to tell all the nations about the Doom day, the Judgment and the hereafter. Because after that there were no more scriptures except Koran the last one.