The Prophet ﷺ said, "Every child is born upon the fitrah, then his parents make him a Jew, a Christian or a Magian" (Sahih Muslim 2658), which shows that the environment a parent places a child in is decisive, not incidental. Sending children to a secular or non-Muslim school is permissible when there is a genuine need and the parents are able to protect the child's creed and character; it becomes impermissible when the child is made to participate in shirk or the religious rituals of others, or when the environment is so corrupting that the parents cannot realistically counteract it. Because you will be asked about it — "Each of you is a shepherd and each of you is responsible for his flock" (Sahih al-Bukhari 893, Sahih Muslim 1829) and "O you who believe, protect yourselves and your families from a Fire" (Quran 66:6) — the obligation does not end with choosing a school: tawhid, prayer, and halal and haram must be taught deliberately at home, and you must stay aware of what is being taught to them. Many contemporary scholars prefer Islamic schooling or homeschooling where it is realistically available and of decent quality, but they do not declare public schooling haram in itself.
Q&A · Youth & Parenting
Is it permissible to send my children to a non-Muslim or secular public school?
Evidence — the daleel
On deen2u
Informational, not a personal fatwa. Consult a qualified scholar for rulings on your situation.