1-What are the top five issues that American (USA) Christians must
overcome if they are going to effectively communicate the Gospel (New
Testament) to the world? 
2-How is this challenge different for communicating with people from:
Europe, Latin America, Africa, or Cuba?
3-What Challenges exist for (USA) Christians wanting to communicate
the Gospel to other religions such as  Islam, Judaism, Buddhism,
Hinduism, Taoism?

Communicating the gospel complies with what Jesus asked us to do at
Matthew 28; 19,20. " Go make disciples....baptising them....teaching
them...ALL THE THINGS I HAVE COMMANDED YOU...until the conclusion of
the 'system of things'...This is NOT limited to the New Testament. It
means the whole Bible. Jesus never denied anything written in the Old
Testament, the history of the Jews. By not denying it, he agreed to
it. Even from the age of 12, he discussed it with the
teachers' [Luke 2;46-47]. To communicate with people of other
countries, some with no knowledge of Christianity, it is necessary to
know the language of that country. And their customs, to avoid social
embarrassments. To get Jesus' message to people with other beliefs,
your teaching cannot be forced on them. To a very large extent, it is
up to those people to have a humble enough attitude and an open enough
mind to simply listen to what you have to say and then, again up to
them, as to whether or not they act on what you have told them.
1Thessalonians 1;4 "For we know brothers loved by God, His choosing of
you". Matthew 12;18 "Look!, my servant whom I chose..." John 6;70 "I
chose you 12, did I not?...1Corinthians 1;27,-29" God chose the
foolish things of the world..."...It seems as if Almighty God has
something to do with choosing who will listen to his word, and looks
for humbleness and compliance. No matter what language is spoken.

How about not annoying people.  I swear I want to deck that woman who
stands by the subway preaching with a microphone.  She should be
arrested for disturbing the peace.

This could be one place to start looking.  Regardless of how you feel
about the Seventh Day Adventists, they are the people familiar with
all the points that you are asking about.

http://lds.about.com/od/mormonmissionaries/

Mayo, 

The link you've given is not to an Adventist site, but to a LDS (Mormon) one.

OH!  Yes, indeed!  Many thanks, Politicalguru.
My apologies to every and all!
Myoarin

Off the subject:  German TV and radio commentators have learned to
pronounce New Orleans as the natives do.

Nelson. Would you be as equally annoyed by someone spruiking outside a
two dollar or record store. My guess is that you would simply ignore
it. If you have any belief at all in the scriptures, would you be bold
enough to approach a stranger to tell him/her of your belief. You may
not believe this, but the message that Jesus was trying to get across
to us is LIFE SAVING. Come Armageddon, everyone doing what Jesus asked
will be saved. Everyone not will be destroyed. Better to have a Bible
shoved in your face [ gently of course] than a .357 revolver.