One of Obama's controversial preachers, a Jeremiah Wright, made a statement about Americans clinging to their guns and religion. The statement was trying to point out racism in America, however, in light of some of the things Obama wants to do, this might be what happens if Obama gets elected.
On religion, Obama is against intelligent design, and while he states he’s a religious guy, he already quit one church for political reasons, which calls his faith into question. He also says that the founding fathers wanted a secular America and supports several things most religious people consider wrong, such as stem cell research on fetuses and abortion.
On gun control, Obama stated he wants to ban the sell of semi automatic firearms and ban the sell of any guns within five miles of a school or park, which basically consists of most of populated America. Thirdly (note the wording of my source on this is "political" so Im not sure about it), it seems that Obama want to make self defense in invalid defense in court, so if you shoot someone breaking into your house, you can’t argue self defense in court.