read the quran and you will know it's god's word if you read it with no previous thoughts but with a pure heart these are the verses you can understand what I meant after reading their translations
Say, "What thing is greatest in testimony?" Say, " Allah is witness between me and you. And this Qur'an was revealed to me that I may warn you thereby and whomever it reaches. Do you [truly] testify that with Allah there are other deities?" Say, "I will not testify [with you]." Say, "Indeed, He is but one God, and indeed, I am free of what you associate [with Him]."
Those to whom We have given the Scripture recognize it as they recognize their [own] sons. Those who will lose themselves [in the Hereafter] do not believe.
And who is more unjust than one who invents about Allah a lie or denies His verses? Indeed, the wrongdoers will not succeed.