The American concept of individualism, often expressed in extremes, is the image of the self-made person and ignores the individual's dependence on essential services and protections. For example, without help from some kind of system (private or public) the individual is not able to furnish himself with a minimum of health care. The great majority of individuals can't doctor themselves or afford the services of a doctor.
In addition, an extremist view of individualism is anti-moral and not Christian. The commandment to love one another implicates or obligates the Christian to be loved by others, and the commandment to love God before all things runs against the idolatry of individualism.