Even though there are different nations, different culture or different habits among the countries of the developing world, the architecture of Catholic cathedrals, churches or chapels has the same goal – to create dignified space for worshipping close to its visitors. A particularity of the Roman Catholic Church architecture (the sacral architecture in general) of the lower economy countries consists in the funding of the projects. While there are many building intentions or projects dealing with complicated financing, a lot of churches, especially cathedrals or basilicas can boast their greatness owing to the Catholic Church itself, enlightened leaders of the countries or many anonymous foreign donors etc. This paper discusses the forms and shapes of the Roman Catholic Cathedrals built in the 20th and 21st century in the third world countries and the access to its felicitous design. Selected examples from the different developing countries all over the world are expounded on the background of the interference of the former colonizers countries architecture (e.g. Sacred Heart Cathedral, Casablanca, Morroco), inspiration from the traditional architecture and materials (e.g. Basilica of Uganda Martyrs, Namugongo, Uganda), creating the own style (e.g. St. Paul’s Cathedral, Abidjan, Côte D’Ivoire) or following the world trends (e.g. Sacred Heart Cathedral, Kericho, Kenya). The gulf between the secular and sacral architecture is not omitted. In conclusion, there are several ways of the access to the design of the Catholic Church architecture in the developing world and these are shown on the examples in this paper. They open the discussion about the life cycle of the architecture, its subsequently costs and well considered choice of the propriety material as well as the shape and resulting form.