That is true, but Pat Buchanan in his book Death of the West said that the reason that Christians aren’t having children in Europe is because of two main reasons: Materialism/Individualism: people are waiting to have children while people are establishing themselves and if they are having children at all they are only having 1 or sometimes 2. The second reason is because even if the birth rate of the native Europeans continues to decline or stays at a mediocre level, the immigrants that move into these countries have a birth rate three or four times higher. So they are being bred out of their countries by immigrants that aren’t doing it for malicious reasons, but if you are Christian it’s a threat to the civilization that you love.