Tinok Shenishba today?

Igros Moshe (EH IV #32.7) Question Is a tinok Sheniba invalid to be a witness? Answer This that I wrote that the children of heretics (Igros Moshe (EH I #82.11) are considered as tinok sheniba even though they are not considered as non Jews they are still invalid as witnesses that is obvious since they on not observant Jews. And they also reject the Torah even though this is beyond their control since this is the way they were raised. They therefore are not aware of the prohibition to lie and that there is a heavenly punishment for lying.  Even if you tell them they won’t believe it.