Firstly: A hypothesis is an idea that rationally explains something and hasn't been fully investigated. A theory is a comprehensive explanation supported by extensive evidence.
Abiogenesis is the hypothesis for which non-living matter becomes living through a natural process. It is a fact that abiogenesis has never been observed and has had several failed attempts at replication in a controlled environment, therefore it remains a hypothesis. While that alone excludes it from being a theory by definition, deductive logic and supporting evidence of steps in the process presses abiogenesis into being the only valid explanation for the origins of life. The question arises how, rather than if, it happened.