Pike sued Day City Community Church for damages he suffered when Pike crashed his motorcycle in an attempt to avoid a cow that had escaped from its corral. The cow and corral belonged to a farm that had recently been left by will to the church. At trial, Pike seeks to ask Defendant's witness, Winters, whether she is a member of that church. The question is 
improper, because evidence of a witness's religious beliefs is not admissible to impeach credibility.  improper, because it violates First Amendment and privacy rights.  proper, for the purpose of ascertaining partiality or bias.  proper, for the purpose of showing capacity to appreciate the nature and obligation of an oath. 