Government intervention would occur if a religious group claims religious allowance for infanticide due to several reasons:

1. Legal Protection: Laws safeguard fundamental human rights, including the right to life and protection against harm, overriding religious practices that endanger lives.

2. Child Protection Laws: Specific laws protect children from harm, irrespective of religious beliefs or practices, ensuring their safety and well-being.

3. Ethical Standards: Societal morals prioritize safeguarding children from harm, contradicting any practice that endangers their lives.

4. International Commitments: Nations adhere to international conventions advocating for human rights, particularly for children, prohibiting practices such as infanticide.

In essence, while governments respect religious freedom, practices that endanger lives, especially of vulnerable groups like children, contradict legal and moral principles. Therefore, government intervention would be necessary to protect individuals and uphold fundamental rights, regardless of religious justifications.