This is not a question which can be definitively answered either way. It is largely a matter of personal belief.
Scientifically there is no evidence for the existence of God or the Devil, so it has not been proven to be "yes". However there is no evidence that disproves the existence of God or the Devil either. As there is no mechanism known to science which requires the existence of any form of God or Devil figure, science largely ignores the question.
Most major world religious belief systems revolve around the idea of a single "creator" or God. This concept of God is largely similar in Christianity, Islam and Judaism but differs in eastern religions such as Hinduism, Buddhism and Jainism.
Christianity, Islam and Judaism also have a "Satan" figure who is claimed to be a fallen angel who personifies evil. This concept is absent from many other world religions.
- A second opinion
There are many who say that the world is made up of opposites and if there is a God, then there must be his opposite, a Satan, an Adversary, a Devil.
This does not stand up to exhaustive enquiry or scrutiny.
- In Christianity, St Paul wrote the Letter to the Colossians, and in that he includes a hymn indicating that all creation exists in Christ, through Christ and for Christ. Evil (absence of good) entered the world through Adam and Eve, according to Christian cosmogony.
- In Buddhism, suffering and evil are caused by the actions of man, and the way to end suffering and evil is through skilful living, right thought, right actions, right mindfulness.
- In Hinduism, there is only God, and all life has its being in His being. Human beings are part of the being that is god. If a human acts against his or her conscicence and out of step with dharma, then they will experience the consequences of their actions. This they may label as evil, but, all Hindus know that what comes to them is their karma, the consequences of their actions.
- Blaming the devil for something is moving responsibility for actions outside oneself. All humans are responsible for what they do unless they are children under the age of reason.