It is not unbelievable. Most if not all Roman Catholics, if they are honest, will tell you they are not sure they are going to heaven. They hope they are, but they are not certain of it. They will tell you it is presumptuous to assume that you will make it into heaven just because you believe in Jesus Christ and received Him as your personal Savior.
Protestants have the certain hope the Bible talks about.
Obama, being a member of a very liberal, borderline ‘Christian’ church, - I can understand why he isn’t sure. Their theology is extremely weak and is more about social politics rather than sound biblical teaching.
Well put.