Police have a warrant to search my home, but I am not a suspect. Do I have to allow the search?

Yes. If police obtained a search warrant to search the premises, that means they have probable cause that there is evidence of a crime located on the premises. Whether you were involved in the crime or not is irrelevant to the nature of the search. However, if police do find evidence that you have committed a crime, it is within their rights to arrest and charge you, so long as they did not exceed the scope of the search warrant when searching the premises.