What constitutes a "substantial burden" under RLUIPA?

A "substantial burden" occurs "where the state . . . denies [an important benefit] because of conduct mandated by religious belief, thereby putting substantial pressure on an adherent to modify his behavior and to violate his beliefs." Warsoldier v. Woodford, 418 F.3d 989, 995 (9th Cir.2005) (alteration in original) (quotation omitted). RLUIPA provides greater protection than the First Amendment's alternative means test. Holt , 135 S.Ct. at 862. "RLUIPA's 'substantial burden' inquiry asks whether the government has substantially burdened religious exercise . . . , not whether the RLUIPA claimant is able to engage in other forms of religious exercise." Id.