The evidence for it is thin, a working model has not been demonstrated, and consensus within science has not been reached. Many religious thinkers believe that the creator's role has been unduly diminished by modern science. They believe that if science's mechanism for evolution and the origin of life on Earth doesn't work, a leading role for the creator is restored. While any science with a hidden agenda is suspect, nevertheless, some respectable scientific research and writing is done in support of creationism. Although scientific answers may be scarce, creationists ask some important questions about evolution and the origin of life on Earth.
Science can tolerate being unsure about some things.
But science cannot entertain the notion that there are phenomena in the everyday natural world that require supernatural intervention. That requirement would emasculate science. Yet that requirement is precisely what creationists, by definition, want to establish. In this way Darwinism behaves much like a religion with cherished, unquestionable beliefs. And so for evolution and the origin of life on Earth a holy war is being waged.