When the Children of Israeel got the message, they were excessively rebellious - so Allaah sent them revelation which was strong and harsh so they would return back to Allaah.
When the Christians got the message, they claimed that Jesus son of Mary died for ALL of their sins, and claimed it was a message of pure love.
When Allaah revealed the message to His final Messenger, Muhammad (peace be upon him) - He sent the message to a people who were rough and harsh by nature (i.e. the bedouin arabs etc.) Yet at the same time, there were good people among them. And this is the case with the majority of humanity today. So He sent a Message which was just right -
the middle way.
We as Muslims have
love for Allaah, for ALL the good which He has given to us and the creation, for free. When we do good, we
hope for His reward, and if we do evil - we
fear His punishment due to our disobedience to Him.
Ibn Al Qayyim, a great scholar said - The
love is like the
heart of a bird, it's required to keep the bird alive, yet the concepts of
Hope and
Fear are like the
two wings, if one was to outweigh or make the other imbalanced, then the bird would fall.
So we have the concept of
love,
hope and
fear to keep us alive on persistent on the path towards Allaah, and this will continue until we die, and move onto the life of the hereafter.
Thus, have We made of you an Ummat [nation - true muslims] justly balanced, that ye might be witnesses over the nations, and the Messenger a witness over yourselves..
[Qur'an 2: 143]