Merry Christmas
When do people usually say "Merry Christmas!"? On the 24th or on the 25th of December?
May I say those phrase to everyone?

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People start saying Merry Xmas to everyone from now onwards.

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As for whether or not you should say it to everyone, I wouldn't.
It's not extremely offensive, but it's not very nice to presume that everyone celebrates Christmas.

"Happy holidays" is considered much more neutral.

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That's right :) People in Russia usually say it on 7th January only.

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I say it on 7th January to some people :)  С Рождеством!