By "important things", I guess things like the existence of God in the first place, Christ's sacrifice for our sin nature, and our fellowship with Him.  Some denominations (I'm going to get some hate mail for this!) focus on Jesus's earthly mother and they pray to her rather than to God, or they focus on their gathering together on a certain day of the week, or they focus on eating only certain kinds of foods, etc.  But in scripture, we see that the big focus is that we are born as sinners and need the gift of Christ's death and resurrection in order to be reunited with God.  It's after midnight and I'm tired, so I may not be describing all this as well as I should be.
Christianity is actually not a "religion" as it normally is defined.  Here's something I found that describes the difference better than I can:
Christianity  is unique in the fact that it is the ONLY faith which is not a religion-  as a 'religion'- by definition means "to be bound" by rules and  regulations and rituals in order that one MAY attain salvation.  (whatever their definition of salvation may be)
This is in stark contrast to the teachings of THE most anti-religious person there ever lived- Jesus the Christ.
Jesus  taught that the truth would SET YOU FREE and that it would be faith  ALONE in His sacrificial death and resurrection for our sins which would  save us and NOT our good deeds.
"For it is by God's grace that  you have been saved, through faith. It is not the result of your own  efforts, but God's GIFT, so that no one can boast about it." (Ephesians  2: 8-9).