The Antichrist will not appear on the scene until after the church is Raptured (Which can happen at any day or hour and or a time that you think not it will happen). It can't be Obama because nobody likes him. It can't be the current pope because the Antichrist actually signs a treaty with Rome and other nations. However, seeing they break the contract with the Antichrist, he then sets out to destroy Rome (Which we see Rome's destruction in Revelation 17-18). Currently it is a mystery who the Antichrist actually is. But it will become obvious who this man is because he will obtain the kingdoms by flatteries and he will sign a seven year treaty with various nations (Including the Jewish nation).