As the Empire grew it became harder to govern and more vulnerable to attacks; invasions by Germanic tribes in the Western provinces contributed to the decline.

A schism that led to the existence of both Eastern and Western Emperors began in the later stages of the decline.

The Gothic War, meant to reunite the Empire, actually caused it a lot of damage.

The full acceptance of christianity by Constantine planted the seeds of intolerance that even flurished in the remnants of the dismembered Roman Empire. This intolerance led to great wars in Europe and eventually caused even such side-effects as Colonialism and perhaps even the Holocaust!

I disagree with you; in his glorius history, Rome faced many germanic invasions. Between the II and the I century BC, Cimbres and Teutones threathened France and Italy. Under the consulate of Publius Rutilius Rufus and Gneus Manlius Maximus (105 BC), Rome lost 80000 troops in Gaul in the battle of Arausius. This was the third defeat the romans suffered against these terrible tribes.
However Rome was young, economically strong, powerful and after two-three years, the famous Caius Marius was able to recruit another army and won the enemy once for all.
That means that Barbarians were always a threat for Rome, but when the empire was wealthy and healty it was easy to face the invasions.
That's why I do not consider this an important factor to explain the decline. I would rather write that barbarian invasions were only a consequence of the chronic desease Rome was suffering in its last moments of life.

the reasons of the decline are the following ones, in my opinion:
civil wars; corruption; heavy taxations and growth of the weight of the bureaucracy.

The parallels with our current empire here in the USA are so terribly obvious. Let's get back to our Christian roots and work at restoring integrity to our society, beginning with ourselves.

I cannot see how the Roman Empire fell because it abandonned its christian roots! If anything it is the other way around.