Cosmological argument argues for god's existence through three ways. Motion, causality and necessity.
The first way is motion. Everything is in motion and is in the process of changing from a potential state, to an actual state.
The second way is causality. All events are caused by another chain of events, like a domino effect. However, someone of something must have pushed the first domino to start the chain of events. If not, there is infinite regress.
The third way is necessity. Everything is dependant on something else for existence, for example, a flower depends on sunlight and water to grow. Therefore, the world must be dependant on something to exist.
Aquinas adopts Aristotle's prime mover that started the chain of events. This force must be unchanging yet inflict change to other things. This is done by attracting.
Strengths of the cosmological argument: Coppleston argues there must be a necessary being that created the universe
Strengths of the cosmological argument: Newton agrees that something must cause a change. Something cannot move itself
Strengths of the cosmological argument: Mackie also rejects infinite regress and argues there must be a being that started the chain of events.
Weakness of the cosmological argument: Kant argues the argument is bases on reasoning and the idea of necessity is only applied to a thought.
Weakness of the cosmological argument: The fallacy of composition argues that just because everything we see has a creator, doesn't mean the world does.
Weakness of the cosmological argument: Russell agrees with Hume's fallacy of composition and argues that "every human has a mother, it is a leap to assume that the universe has a mother"
Weakness of the cosmological argument: Infinite regress is possible in reality, for example maths. However, modern physics argue that there is evidence that the universe is 13.7 billion years old.
Weakness of the cosmological argument: Hume argues that an effect is not necessarily from a cause. Bus stop analogy.