Why is the Gospel not simple?

Romans 10

 ¹ Dear brothers and sisters, the longing of my heart and my prayer to God is for the people of Israel to be saved. ² I know what enthusiasm they have for God, but it is misdirected zeal. ³ For they don’t understand God’s way of making people right with himself. Refusing to accept God’s way, they cling to their own way of getting right with God by trying to keep the law. ⁴ For Christ has already accomplished the purpose for which the law was given. As a result, all who believe in him are made right with God.

Salvation Is for Everyone

 ⁵ For Moses writes that the law’s way of making a person right with God requires obedience to all of its commands. ⁶ But faith’s way of getting right with God says, “Don’t say in your heart, ‘Who will go up to heaven’ (to bring Christ down to earth). ⁷ And don’t say, ‘Who will go down to the place of the dead’ (to bring Christ back to life again).” ⁸ In fact, it says,   “The message is very close at hand;
      it is on your lips and in your heart.”
   And that message is the very message about faith that we preach: ⁹ If you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. ¹⁰ For it is by believing in your heart that you are made right with God, and it is by confessing with your mouth that you are saved. ¹¹ As the Scriptures tell us, “Anyone who trusts in him will never be disgraced.” ¹² Jew and Gentile are the same in this respect. They have the same Lord, who gives generously to all who call on him. ¹³ For “Everyone who calls on the name of the Lord will be saved.”
 ¹⁴ But how can they call on him to save them unless they believe in him? And how can they believe in him if they have never heard about him? And how can they hear about him unless someone tells them? ¹⁵ And how will anyone go and tell them without being sent? That is why the Scriptures say, “How beautiful are the feet of messengers who bring good news!”


The more I read about Christianity from a number of different places the more cross I become. It seems to be that people seem to want to spend an inordinate amount of time and energy debating things that although they matter are inconsequential to the main point of being a follower of Jesus. One of these subjects is the battle between Calvinism and Arminianism. I read one such example on the Desiring God blog the link is below :
http://blog.beliefnet.com/jesuscreed/2007/11/letter-about-those-pesky-calvi.html



Now I am not the right one to have a theological debate with Calvinists or anyone who has a different viewpoint. I have read the theories and would identify myself as a Calvinist however I do not for one minute think that I know everything about the wonderful acts God performs in my salvation. Election, predestination, limited atonement are all things that are very interesting to study and nice to try and understand. But the thing I do not comprehend is how some people seem to think that if you do not believe exactly as they believe then you are not really saved.
Am I wrong in my belief that at the end of the day they are not actually that important? Whether God uses one method or another method for my Salvation seems like semantics to me. What matters more is that I am saved surely.  Surely the Gospel is really quite simple. I am a sinner. I think we can all agree on that one if you don't believe that I am sure in further discussion that I can convince you. 
I cannot put things right myself. Its obvious to me that looking at God's law in its entirety that I cannot live up to that standard.
God is a righteous judge. We will be judged. We can argue about this but as our creator God has a right to judge us for the way we live.
The punishment is Hell. Not popular to talk about but if I have to face the consequences for my sin then I am going to Hell.
Jesus came down to earth to offer us a way out. Jesus died to take our place so our sin could be dealt with and we could have relationship with God. Because of this we go to Heaven and not Hell.
We only have to accept Jesus offer. It is not about us being good, getting good or staying good. Its all about Jesus.
So what do we have to do?
Romans 10 verse 9-10 tell us the truth:
⁹ If you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. ¹⁰ For it is by believing in your heart that you are made right with God, and it is by confessing with your mouth that you are saved.


Don't know about you but that seems simple to me. So why do we seek to make the Gospel that is simple to be so difficult. When Karl Barth was asked what was the greatest theological truth he had learned his answer was "Jesus loves me this I know, for the Bible tells me so."
We have a simple Gospel to proclaim to a World that needs God's grace. Does anything matter more than this?