USA had a different native culture of Red Indians and others. It is all wiped out.
Same with Latin America, South America, Africa.
Same is happening in India too.
In North-east India, the native cultures are all wiped out. It is all Christian culture now.
In the rest of the India, it is more and more Christianity every day.
There is one more ultimate proof.
That is yourself.
8 years back, you converted to Christianity. You may think that you did a good thing. Fine for you.
Earlier, you had the Indian/Hindu culture, now you are more of Christian culture.
You may argue that Christian culture is better than Hindu culture. That is a different point.
But, to the extent that you converted to Christianity from Hinduism, to that extent, Christianity wiped out Hinduism. This is at the level of one person like you. Now, think of it at the level of so many individuals, so many societies and communities.
One fine day, if your evangelization program gains more and more strength, Hinduism would be entirely wiped out by Christianity. You may say that is good. But, this is a different point. The point is, when Christians become a majority, it is the death of one more culture called Hinduism. You may be happy about it.