Whenever, in the case of any united parish containing two or more parish churches, any persons have undertaken to endow one of the said churches along with a district, being part of such united parish, to be attached thereto, it shall be competent for them to apply for the disjunction of such district, and for the erection of it into a parish quoad sacra, in terms of the eighth section of the said first-recited Act, and for the court to entertain and dispose of such application in the same manner and to the same effect as if the persons applying for such disjunction and erection had, at his, her, or their expense, built or acquired, or undertaken to build or acquire, a church, in order to its being erected into a parish church in connexion with the Church of Scotland: Provided also, that it shall not be necessary for the persons applying for such disjunction and erection to make any provision for the maintenance of the fabric of the church which they shall have undertaken to endow as aforesaid.