The best testimony of the life in the other planets of the space is of cause the theory of evolution. If in the earth life has developed until human beings in 5 billion years, and universe is 13.8 billion years old, there probably is other life forms in other places too. At least 9 billion years ago already human- level life. And about 5 million years there has been cultures to develop further from where we are now. What kind of beings they might be? This makes probable even god- like beings. This makes the existence of the gods probable, which is more than we have in philosophy and theology, where there is no proof for gods existence. All proofs have been shot down.
This is of cause only a probabilistic proof, can it be shot down? Has it been discussed here?