Do American Christian Universities and Colleges offer as high quality education as other countries?
Christian universities in the United States are tremendously diverse.  The fact that a particular university is "Christian" tells you only that it is not a government owned university.  Almost no other conclusions can be drawn from a Christian identity.  

Each university makes its own curriculum.  A science department at one university may exclusively teach science based on religious beliefs.  A science department at another "christian" university might not employ anyone who knows anything about christianity.