I accept your worry and really this is a big challenge in western countries to secure one’s faith and deen. But when we see Eastern countries either Gulf countries or Middle East or Indian sub continent, even these countries are also not that much safe and clean. Therefore the only solution is remaining for us to see the true guidance of Ahlul Bayt (a.s). If we see their life and guidance they always focus an building up true faith in Allah (swt) we Muslims have many things on the name of religion but we don’t have true faith and awareness of Islam. That is why we are losing our generation. In my view if we give time to our children and tell them openly about the situation and culture what we have in both east and west and this saying and whispering should continue till they reach to their age of puberty then inshallah Allah will help us and them too. But we should try to teach them the very basics of Islam for example never tell lie,never hurt others feelings, never do oppression, never forget hereafter and Allah.
Inshallah Allah will help as He is the best Helper. As Holy Quran says:
وَلِلَّهِ الْمَشْرِقُ وَالْمَغْرِبُ فَأَيْنَمَا تُوَلُّوا فَثَمَّ وَجْهُ اللَّهِ إِنَّ اللَّهَ وَاسِعٌ عَلِيمٌ

And Allah's is the East and the West, therefore, whither you turn, thither is Allah's purpose; surely Allah is Ample-giving, Knowing.(2:115)