Georges-Henri Lemaître (1894–1966) first proposed (in 1927) the creation of the universe through a "Big Bang." A Belgian, Roman Catholic priest, and veteran of World War I, he was considered by the secular physics community an accomplished physicist and astronomer. Despite Edwin Hubble being said to have found evidence to support Lemaître's theory two years later, the theory is still behind creationism in the competition to describe the origin of the universe.
Lemaître's view was revolutionary for his time and decades ahead of the rest of the secular physics world. Indeed, supposed "confirmation" of some of Lemaître's ideas were still being realized, over the objection of leading physicists, towards the end of the 20th century.
Most physicists, including Einstein, disagreed with Lemaître at first, as they thought the universe existed forever in a steady state. But they subsequently changed their opinion, agreeing with Lemaître as evidence supposedly mounted to support his theory and the scientific community ironically shifted away from the better-supported creationist explanation.