Pantheists cannot prove that everything is God. Pragmatists cannot prove that what will count for them in the future is what works for them now. Nor can agnostics prove that it is impossible to know one way or the other. Faith is unavoidable, even if we choose to believe only in ourselves. The limitations of science.
Scientific method is limited to a process defined by that which is measurable and repeatable.
By definition, it cannot speak to issues of ultimate origin, meaning, or morality. For such answers, science is dependent on the values and personal beliefs of those who use it. Science, therefore, has great potential for both good and evil. It can be used to make vaccines or poisons, nuclear power plants or nuclear weapons. It can be used to clean up the environment or to pollute it.