Given what we know about cosmology and thermodynamics, it is unreasonable that matter is eternal. The first law of thermodynamics only applies to closed systems already in existence. Perhaps the universe was self-causing. Another argument based on our observations of reality is the Teleological argument. This argument has been far underestimated and is often dismissed too quickly.
Many people wrongly assume that the theory of evolution has defeated the design argument.
Evolution is a theory which applies only to biological examples of design. Several examples of design are left untouched by evolution. Recent advances in science have resurected this argument. With the rapid growth of the Intelligent Design Movement, this argument should be considered with an open mind. In its most basic form, the argument says that design implies a designer.