keep the architecture exactly as shown add polished wooden pews aligned along the nave all facing the altar place a marble altar platform at the front with a priest in vestments standing behind it in front of the stained glass above the altar add a dignified statue or symbolic figure of jesus scaled appropriately to the space and lit by the stained glass glow populate the pews with worshipers oriented toward the altar add a choir in the upper balconies with visible variety in age gender and clothing some in choir robes and some in formal attire maintain the bright heavenly stained glass lighting and the sacred uplifting atmosphere of the church interior