If a religiously identified separatist or other group is violent, the answer would depend on whether their violence is a legitimate form of self-defense or whether the group is inherently violent or terrorist. In the former case any human rights violations against them would also be violations of religious freedom. This is not a violation of religious freedom since under international standards families can legitimately make such decisions. However, any physical attack on the child would be a violation of religious freedom. A family forbids an underage child to convert or marry someone of different religion.
International standards allow families to make such decisions.
Not necessarily, as there is no universal right to be able to work in a country other than one's own. A decision by a country either to fund or not to fund education by religious groups can be consistent with religious freedom. The question is one of discrimination, that is, whether some groups are denied funds because of their beliefs while others are given funds. Many more examples clearly could be given of situations where answers to questions of religious freedom are by no means obvious. Religious freedom can be violated by a government or another religious group even if the violation is not itself for religious motives.