interfaithless

not-comparable of a marriage usually

(of a marriage, etc.) Between people who come from different religious backgrounds but are personally unconcerned with religion.

Japanese Meaning

（結婚などの場合において）宗教的背景が異なるが、個々は宗教に対して無関心な関係

Their interfaithless marriage attracted little attention because both partners were personally unconcerned with religion.

二人は個人的に宗教に関心がなかったため、宗教的背景が異なる者同士の結婚はほとんど注目を集めませんでした。

Sense（1）

(of a marriage, etc.) Between people who come from different religious backgrounds but are personally unconcerned with religion.