So then faith comes by the thing heard.
Yes, or more precisely, the thing believed comes by motion out of the thing heard. This means faith is not a stand-alone something, as most conceptualize.
If someone preaches the gospel then we hear the Rhema right?
Right.
Or are you saying that if the gospel is poorly delivered then we might not have the Rhema?
Exactly. If it is inadequately or insufficiently delivered, then it is not the Rhema; therefore if it is not the thing thought and spoken about and forth by God, it is another thing heard and believed. That's why there are so many gradients and tangents of belief.
The underlying reality of God in the gospel?
God is a hypostasis. Faith is the hypostasis of things hoped for...
Faith is the flowing of God speaking forth the underlying reality of existence (hypostasis - that which foundationally and objectively underlies reality for existence). It's about the new creation of us having our existence in Christ by faith... born from above.
Not everyone preaches the same gospel. The Calvinist hesitates on the 'died for your sins ' bit.
There are many subtelties as "a" gospel, but that isn't possible. There is no indefinite article in Greek, while English is utterly driven BY the indefinite article. There can't be other gospels, numerically; so there can only be qualitative gospels, but Galatians says they're NOT another. There is only one Gospel, and we are to all speak the same thing. English structural miscomprehension is one huge impediment for that unless/until hearts and minds are conformed to something besides the patterning effects of their English first language.
I think I see what you are saying though I am wondering how this all renders the hearer. You seem to be suggesting little or no participation by the person hearing the gospel.
We have access BY faith INTO the grace wherein we stand. Repentance is granted. That's why the Monergism of the Reformed tradition is more functionally applicable for modern western minds; while Synergism was more functionally applicable for more ancient and eastern minds.
It requires understanding the interface of God's timelessness with the chronological form of time in the fallen earth ages of the cosmos. For God, there is NO time. Time is created, as is space and matter. God is both "no-when" and "every-when", just as He is "no-where" and "every-where". There is no linearity or sequentiality or duration or elapsation for God in any manner related to time. Most views depend on varying fallacies of superimposing time upon God to understand what is theologically referred to as "Ordo Salutis" (order of salvation).
The "here" and "now" for all peoples of all earth ages since creation ALL have a sense of contemporaneous "nowness" to God. This takes some time and effort in the spirit to understand and be conformed to as the renewing of the mind. It can (and should) be discipled and taught; and it is epistemological and ontological, with methodologies emerging as the "doing" from "being"... in Christ.
This is not happening in the modern Church-at-large.