Check my writing please

I'm practicing writing an essay about knowledge. Here's a prompt

"The quality of knowledge is best measured by how many people acept it." Discuss this claim with reference of two areas of knowledge.

Here is the written essay.

The more people accept the knowledge or belief the more reliable it is. If one has personal knowledge and one has proved from shared knowledge it becomes concrete knowledge and it can be tricky to be dismissed if many people has accepted that knowledge. For instance, Alex believes that ghosts are exists but most people stick to the idea that ghosts are metaphor and doesn't exist. Alex trying to claim that ghosts are real and the atempt to claim that ghosts are exist failed because most people has accepted the idea that ghosts aren't exist and has proved it in a scientific way. If Alex find an evidence he might be able to dismiss what people accepted. To summarise, Knowledge can be dismissed with an evidence. However, it depends on how concrete the proof is and how people think of it.

Is it natural? Are there any grammatical errors? Is it ok? regarding the prompt and essay.