Ok, let's look at this in terms of grammar. After all, the question asked which sentence is grammatically correct. First, let's get rid of some words that may be confusing the issue. "Who believes in this prophet" is describing, or defining, he/him. It is a restrictive clause. Its only purpose is to define he/him. As a restrictive clause, it is a descriptive clause. We can remove it to figure ...
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Many people use "let, let's and lets" in conversation What's the difference between them?
meaning - Difference between Let, Let's and Lets? - English Language ...
Let’s is the English cohortative word, meaning “let us” in an exhortation of the group including the speaker to do something. Lets is the third person singular present tense form of the verb let meaning to permit or allow. In the questioner’s examples, the sentence means to say “Product (allows/permits you to) do something awesome”, so the form with lets is correct.
verbs - "Let's" vs. "lets": which is correct? - English Language ...
I find the distinction that MacMillan makes between not to mention and the supposedly synonymous let alone and still/much/even less useful: The phrases let alone and still/much/even less reinforce a negative or unlikely statement that precedes them. The still/much/even less constructs reinforce the negativity of the preceding phrase by subtraction -- Negative statement, still/much/even less ...