Religiously-motivated behavior does not constitute "habit" for purposes of Rule 406.

United States v. Mayberry, 540 F.3d 506, 515-516 (6th Cir. 2008) (upholding trial court's admission of police informant's prior sworn statements made during his grand jury testimony as prior inconsistent statements because....A prior inconsistent statement of a witness is admissible, not only to impeach the witness, but also as substantive evidence -- to prove the truth of the matter previously asserted by the witness -- only if the prior consistent statement was made under oath.

United States v. Sinclair, 109 F.3d 1527, 1536-1537 (10th Cir. 1997) ("Although Rule 602 provides that a witness's testimony must be based on personal knowledge, it 'does not require that the witness' knowledge be positive or rise to the level of absolute certainty. Evidence is inadmissible ... only if...A person has the personal knowledge that a witness must have if and only if the evidence is sufficient to permit a reasonable trier of fact to conclude that the witness personally perceived the matter. The preliminary question of personal knowledge is governed by the standard of whether the evidence is sufficient to allow a reasonable person to conclude that the person has personal knowledge; the applicable standard is not the more demanding preponderance of the evidence standard.

Corley v. Burger King Corp., 56 F.3d 709, 710 (5th Cir. 1995) (holding, in plaintiff accident victims' action against defendant's manager for personal injury, that the trial court erroneously excluded plaintiffs'....A statement is imputed to a principal or to an employer and is treated as the principal's or employer's vicarious admission (which, like other admissions is exempt from the hearsay rule) if the principal or employer is a party, the statement is offered against the principal or party, the statement is a statement by the party's agent or employee about a matter within the scope of the agent's agency or the employee's employment, and the statement is made during the principal-agent or employer-employee relationship.