The Bible does teach what you say and I am not wanting to change that. However I think there is more to it. I do not see that the synergists are totally wrong.
Wrong about what?
I do not understand election. Some say elected to a future adoption. Some say elected before the world began. Here some big issues come up.
Election simply means to be chosen. When talking about salvation, the qeustion between monergists and synergists is this:
Are we chosen
to be saved (monergists)?
Or are we chosen because we are saved (synergists?)
It seems to me that the bible is speaking of chosen to be saved, anytime it talks about predestination or choosing. For example Acts 13:48 says that the gentiles heard the gospel message and
"as many as were appointed to eternal life believed" They believed because they were appointed to eternal life. They were not appointed to eternal life because they believed.
And again in John 10 Jesus syas to some unbelievers "The reason you do not believe is because you are not my sheep". Notice, he does not say "The reason you are not my sheep is because of your unbelief". But rather, he declares that unbelief is evidence of not being a sheep, and belief is evidence of bieng a sheep. In other words, the sheep WILL believe,
because they are sheep. He does not say "the reason you are not my sheep is because you dont believe", but rather, he says "The reason you don't believe is
because you are not my sheep". His sheep, he says "hear my voice, and follow me...
because my Father gave them to me"
If God elected some to a future heaven then he elected others to a future hell. As you say, hard to swallow and reconcile. Especially as it is God who 'imputes' sin on man.
All of creation is God's own possession, and He can use it to glorify himself however He wants.
Here is where I stumble :
1. Why need evangelism ? All is prefixed.
With these questions, again you misunderstand. The elect will not be in heaven willy-nilly, regardless of whether or not they hear the gospel message, believe it, and turn to Jesus. But rather, God uses means to bring about our salvation. Evangelism is a tool that God uses, a means, that He uses to bring about our salvation. He not only elects us, but puts into place tools and means to bring our salvation to fruition. He elects us, and in time, during our lives, sends a messenger our way with the gospel message. Through that message, God then works on our hearts to produce faith and repentance, so that we believe the gospel.
Look at Paul's attitude about evangelism and election. Paul was an amazing evangelist who suffered many hardships such as imprisonment, shipwreck, persecution, etc. Yet he says:
2Ti 2:10 Therefore
I endure everything for the sake of the elect,
that they also may obtain the salvation that is in Christ Jesus with eternal glory.
Paul's reason, his motivation, for evangelism was to see the elect get saved. In other words, election is the cause for evangelism. Rather than election deterring evangelism, it is the driving force behind it! Many of the greatest evangelists in history (Charles spurgeon, george whitfield, william carey) are Calvinists who evangelized because they believed in election.
They knew that God had an elect people, and they felt privileged to be used by God to bring about the salvation of God's elect.
The person who believes in election has all the reason int he world to evangelise. Because we know that our mission will not be in vain. We know that every single person that God intends to save will be saved through our efforts.
The synergist has no such assurance. he could go his entire life and evangelize yet there is no guarantee that even a single person will be saved by their efforts, because there is no positive decree of God to save even a single person. It's pure chance whether some people believe or not, in their system.
I honestly don't know how I could sleep at night if I was a synergist evangelist. I would feel like my success depended on how convincing my gospel message was. If I was not very good at evangelism, men's souls would be at stake.
However the Calvinist sleeps well knowing that God has a 100% success rate through our global efforts, and we are privileged to be used by God to see His elect saved. We know that 100% success is waiting for us. Every single elect person that hears the gospel, God will, without fail, bring them to salvation sometime in their lives. Why?
Because it's God that does conversion.
2. Why need repentance ? All is prefixed.
Same answer as above.
3. How can man be held accountable for not turning to God when God closed that man's eyes and ears, withheld a new heart ?
I do not understand.
God is not obligated to give the new heart. It is man's fault (morally) for his heart that is unwilling to turn. We know that much. God judges men for their unwillingness. So we know that God holds man accountable.
If a teacher assigns homework, and some students get drunk and are unable to do the homework (physically unable), then the teacher is not at fault for his/her refusal to move the homework due date back. In like manner, we as sinners are unable to come to God without a new heart, but God is not at fault for his refusal to grant the new heart. He is not obligated to do so. If the teacher moves the due-date back, it is pure mercy for her to do that. And if God gives a new heart, it is pure mercy for Him to do that. He is not obligated to do that and nobody can demand it, because mercy by definition is non-obligatory, cannot be owed and cannot be demanded.
It also undermine assurance. I not understand so then does it mean I am not actually saved. If it does then there is nothing I can do about it. No works will be good enough. So to bad for me.
If you believe in Jesus, you know for a fact you are among the elect. Only the elect believe in Jesus.
(this is true whether synergist or monergist, so I'm not sure what your argument is)