No, they were not. The Catholic Church frequently commissioned works such as altarpieces, but many religious works found in Churches at the time were donated by other patrons. Wealthy families would commission the works and then donate them to the Church. These works would show the piety of the patrons.
Architects.
Memphis Design is an Italian firm specializing in furniture and home decor. The company, based in Milan, was a collective of designers, artists and architects both local and worldwide.
the Medici family.
Metalworkers Architects and Sculptors
The Humanism of the Renaissances reflected in its art by influencing artists and architects to carry on classical traditions.
They are also mathematicians because you have to measure if your an Architect.
For a long time it was common for artists to be proficient in various arts. Painters or sculptors who were also architects are e.g. Giotto, Brunelleschi, Ghiberti, Raphael, Leonardo da Vinci, Michelangelo, Bernini, ...
Giorgio Vasari, an Italian painter and architect, wrote the book "Lives of the Most Excellent Painters, Sculptors, and Architects," commonly known as "Lives of the Artists." Published in 1550, the book is an important source of biographical information and art history of Italian Renaissance artists.
The Humanism used their renaissance art to influencing artists. This also had architects carring on classical traditions.
Reflected concern with form and order
Caravaggio.
Bruelleschi served as an inspiration to architects and artists of the Renaissance, especially in Italy.