Can children be atheists ?

My youngest got confronted and hassled about her not believing in “God” by one of her classmates and the classmate said that god could make her belief in God and my daughter said God could not.

The classmate counter that God could do anything and again my daughter said God can not, the classmate then listed all the things God has done saying God can do anything and there were no other Gods.

My daughter retorted that the class mate was wrong that her God could not make a 4 cornered triangle and could not make her believe in him.

This she relayed to me with a smug grin on her way home

Needless to day after this exchange on the schoolyard the teacher had a stressful afternoon with the class the majority of whom are meant to be making their first holy communion in a few months.