Faith is an excuse for cowardly morons to believe in any childish nonsense that makes them feel good.

Wikipedia - Faith - Criticism

Criticism

Bertrand Russell wrote:

Christians hold that their faith does good, but other faiths do harm. At any rate, they hold this about the communist faith. What I wish to maintain is that all faiths do harm. We may define “faith” as a firm belief in something for which there is no evidence. Where there is evidence, no one speaks of “faith.” We do not speak of faith that two and two are four or that the earth is round. We only speak of faith when we wish to substitute emotion for evidence. The substitution of emotion for evidence is apt to lead to strife, since different groups substitute different emotions. Christians have faith in the Resurrection; communists have faith in Marx’s Theory of Value. Neither faith can be defended rationally, and each therefore is defended by propaganda and, if necessary, by war.
— Will Religious Faith Cure Our Troubles?

Evolutionary biologist Richard Dawkins criticizes all faith by generalizing from specific faith in propositions that conflict directly with scientific evidence. He describes faith as belief without evidence; a process of active non-thinking. He states that it is a practice that only degrades our understanding of the natural world by allowing anyone to make a claim about nature that is based solely on their personal thoughts, and possibly distorted perceptions, that does not require testing against nature, has no ability to make reliable and consistent predictions, and is not subject to peer review.

Philosophy professor Peter Boghossian argues that reason and evidence are the only way to determine which "claims about the world are likely true". Different religious traditions make different religious claims, and Boghossian asserts that faith alone cannot resolve conflicts between these without evidence. He gives as an example of the belief held by that Muslims that Muhammad (who died in the year 632) was the last prophet, and the contradictory belief held by Mormons that Joseph Smith (born in 1805) was a prophet. Boghossian asserts that faith has no "built-in corrective mechanism". For factual claims, he gives the example of the belief that the Earth is 4,000 years old. With only faith and no reason or evidence, he argues, there is no way to correct this claim if it is inaccurate. Boghossian advocates thinking of faith either as "belief without evidence" or "pretending to know things you don't know".