Why is the gospel the power of God?

Paul says in Romans1:16 ' For I am not ashamed of the gospel for it (the gospel) is the power of God unto salvation to everyone that believes (the gospel message) to the Jew first and also to the Greek.'

So why is it the power of God to salvation (rescue from bondage)?

Romans1:17 For (because) therein (in it - the gospel) is the righteousness of God (the very righteousness of God imputed to man free of charge) revealed from faith to faith.

It's like a jar of the best jam in the world being labelled 'good.' 'Gospel' meaning really good news is simply labelling the content of the message (being God's gift of righteousness) as being really good.

With this in mind we could paraphrase verse 16&17 to be:-

'I am not ashamed of the really good news of Christ's finished work, for this news will release the power of God to break free everyone from whatever bondage there are in, It doesn't matter who you are, what your background is because this really good news is declaring that ALL are made right in God's sight by simply believing that it's true'

It's the content of the jar that we are interested in here, the gospel is the power of God because it contains the message that we are made the very righteousness of God by believing resulting in deliverance power.
...they which receive abundance of grace and of the gift of righteousness shall reign in life..Rom5:17 as opposed to being in bondage in this life.