Do Synergists Have a Right to Believe in Eternal Security?

Synergism is literally "Cooperation". But Synergism also represents another option... Autonomous free will (also called Libertarian free will).
I've never heard Libertarian believers call their "free will" autonomous... Mostly because they see an issue with that definition. Saying that God isn't your governing king is a scary thought.

Honestly. Those who support eternal security cannot defend it accurately. The most beautiful passage on the subject is despised by defenders of autonomous free will:

John 6:37-44 English Standard Version (ESV 2001, Crossway)

37 All that the Father gives me will come to me, and whoever comes to me I will never cast out. 38 For I have come down from heaven, not to do my own will but the will of him who sent me. 39 And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day. 40 For this is the will of my Father, that everyone who looks on the Son and believes in him should have eternal life, and I will raise him up on the last day.”

41 So the Jews grumbled about him, because he said, “I am the bread that came down from heaven.” 42 They said, “Is not this Jesus, the son of Joseph, whose father and mother we know? How does he now say, ‘I have come down from heaven’?” 43 Jesus answered them, “Do not grumble among yourselves. 44 No one can come to me unless the Father who sent me draws him. And I will raise him up on the last day.

All the Father gives to the Son, WILL come to the Son. And those who go to the Son WILL NOT be cast out. He will lose none to go to him, but will raise them up on the last day...

So why shouldn't Synergists believe in eternal security? Because if your free will can get you into the hand of God, then your free will can get you out.

Those who say John 10 doesn't teach eternal security, don't believe this text speaks about salvation, because of they did then this text preceding that one should be enough to teach eternal security. Be consistent synergists!!! Think this through!!

Soli Deo Gloria!