The hyphen would normally be omitted for both. For me, 'sparsely populated' is the more common expression. 'Scarcely populated' isn't really right. It's a wrong use of words - but it's not a grammatical mistake.
No, it is not grammatically correct to say 'support to.' The correct expression is 'support for,' as in "They provided support for the project."
"God help you" is the correct phrase, as it is a traditional expression of sympathy or encouragement. It is not a grammatically correct sentence, but rather an idiomatic expression.
"I am friends with X" is correct."We are friends" and "X and I are friends" are also correct."I am friend with X" is not correct.
Yes, "May God bless him" is a correct and polite expression. It is often used to convey good wishes and blessings to someone.
"Not like that" can be grammatically correct, depending on the context.
Yes! That is grammatically correct!
Yes, 'for free', is grammatically correct.
It is not grammatically incorrect, but not right, either. We say wishes come true.
Yes, the sentence is grammatically correct. It conveys a positive expression of anticipation to meet a group of people in the future.
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
Yes, Almighty God is grammatically correct.
"That was wrong" is a grammatically correct sentence.