Conflicts over religions differences and oil supplies in the middle east

affect American foreign policy today

Explanation:

Conflicts over religious differences and oil supplies in the Middle East affect American foreign policy today.

They are in fact the main concern in the United States foreign policy.  This is shown for example through their involvement in many wars or invasions in the last 30 years, to secure the provisioning of oil for the US citizens or prevent other major terrorist attacks like the ones from September 2001.

We can't see however all the decisions or actions taken by the US government throughout the years were made to calm the tensions and find peace.