Good luck with that.
I will point out that all of the major religions in the world today have vastly outlasted every society that exists on Earth today.
Governments rise and fall. Armies march, countries are destroyed and new ones created. People are slaughtered because of their religion, or their skin color, or where they live or who their parents and grandparents were. But religion is always there. Always, in every society, in every tribe, in every hamlet of Humanity clear around the world and throughout history.
Regardless of your faith or lack thereof, this would tell the thoughtful and prudent person that there is something about religion that satisfies a very basic human need.
When you stand up and try to fight human needs…try to compel people to be what they are not…you will lose. Every time. All the time.
The Atheist community in the West has become noisy enough and obnoxious enough to religion that once again religion is rising. In the USA particularly - and with some specific exceptions through our history - religion has been mostly somnolent. The social covenant of “you leave me alone, I’ll leave you alone” has worked pretty well for a long time. And so the broad and deep strain of religious fundamentalism that has ALWAYS been present in our society has been quiescent and under control, and we have all benefited from the good that religion brings, while not being harmed by the evil that unfettered religion always brings about.
But now the increasingly noisy, self righteous, and abrasive non-believers are arousing the giant. Overt religiousness is on the rise in the USA. And there is no combination of power in the USA - in the whole world - that can stand against religion when it begins to march. I do wonder if our institutions can possibly survive, this time.
When someone says Merry Christmas to you, whether you are christian, jew, muslim, hindu, atheist, or whatever, you should just smile and say Merry Christmas right back. When you greet a friend, you should greet them in a fashion that is appropriate to their religion - they will appreciate that.
When someone puts up a religious display, if it doesn’t suit you just ignore it.
When a family member pesters you about religion, avoid that person as much as possible and when not possible just refuse to make an issue of it.
You can’t win. You’ll never win. If you are aggressively atheist, you will be crushed. Because, ultimately, it really doesn’t matter a bit whether the universe was created or just appeared through natural processes. It doesn’t matter whether you have a soul that will go to heaven or hell or not.
None of this matters, not even a little bit. Because there is only one thing that DOES matter, and that thing is that people want to believe. And you will never, ever stop them from believing. And if you become too insistent, they will destroy you.