Mark, this is a really important set of questions, and I hope I can do it justice with my answer.
No, we aren’t using the it the same way.
To begin with, the Gospel and Christianity are not equivalent. The Gospel is an announcement of salvation through Jesus Christ. The most basic form of it is stated in the New Testament book First Corinthians, Chapter 15, verses 1-6 (I Corinthians 15:1-6). It’s from a letter that the Apostle Paul wrote to the church in the city of Corinth:
Now, brothers and sisters, I want to remind you of the gospel I preached to you, which you received and on which you have taken your stand. By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain. For what I received I passed on to you as of first importance:
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that Christ died for our sins according to the Scriptures,
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that he was buried,
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that he was raised on the third day according to the Scriptures, and
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that he appeared to Cephas, and then to the Twelve. After that, he appeared to more than five hundred of the brothers and sisters at the same time, most of whom are still living, though some have fallen asleep.
The bulleted points are the Gospel announcement. This announcement is the heart of Christianity. It is what Christians see as the evidence of Jesus’ divinity, God’s presence among us in human form, the demonstration of God’s desire to be with people, and the gift of salvation that makes that possible. I don’t believe that this announcement is an ideology.
Here, I think we can agree on much. We could probably rework the Google search result you got a bit and have it fit Christianity a little more, and still fit with your point:
of religious theory (beliefs/doctrines) and related practices.
I am more extreme in my views on Christianity mingled with economics and governance. I think we have enough evidence that wherever and whenever Christianity has been claimed to be used as the basis of government, it became one of any other religions that was used for social control.
The how of belief matters, doesn’t it? In fact it changes the thing believed.
When Christianity is used as a tool for governance, and particularly govern civil society, it is no longer Christianity. Civil societies are governed with coercion/force, competition, money, and the like.
In contrast, the heart of Christianity, the Gospel, shows us the power of weakness, service, generosity and humility. Those don’t form a very effective theory of government or economy.
So, while I agree that the religion of Christianity does include ideology and may be more than ideology, the heart of Christianity, the Gospel, does not.
You mentioned this in an slightly earlier post:
And I agree with you. And this is true of Christians specifically. We come to the world with a point of view related to our systems (since there are myriad of Christian traditions and beliefs) of belief and webs of ideologies. And those play together in dialectical relationships as well.
But the Gospel, the announcement of the Good News through Jesus Christ is not an ideology. Speaking ideologically, the Gospel is supposed to be the rock-bottom message that unifies all Christians everywhere throughout time. For Christianity to actually function, the Gospel announcement (Jesus Christ, God’s Son saves!) needs to be our central focus, our attestation, not (mainly) a mastery of the beliefs of Christianity.
If I failed to answer your questions, ask away again.