You can't get any reward by telling that you are agnostic. Since there is no socially constracted space for agnostics. So just choose your families religion. Act according to and date the one who is not active on that specific religion So if you both arent active there is no pressure to be religious, exercise some activities if you have no problem of exercising it. So agnostic mehonikin mawek that info lemanim silemaytekim just pick one religion, act as if you are not active