Wow, I was literally thinking about this exact topic just recently.
I was actually going to propose that we should have as a part of the CF universe "canon" that there is this theory - it's authors are irrelevant at this point - about a dynamic Jesus.
I think this is a huge point of realism that we should maintain for this universe. If there really were dynamics, what would skeptics say? They would propose that Jesus was a dynamic. It makes sense, so I think we should definitely have this as a popular new anti-religious theory as dynamics are becoming more and more well-known.
Part and parcel of this theory should be a belief that other miracle workers throughout biblical history were also dynamics. Elijah is a prime example of this, with the obvious first choice being that he was believed to be a pyrokinetic.
An interesting dynamic of the Jesus dynamic theory, which I think deserves to be worked out in some detail so that our characters have to combat plausible-sounding arguments from the world, is the psychology of Jesus.
Within this theory, as the greatest dynamic who has ever lived, it would be proposed that Jesus developed a God-complex (basically that you are semi-divine if you have control over the elements - and because he had power over all the elements.....), and sorta went mad with the power he had (should I capitalize 'he' in this case???

), and believed himself to actually be the fulfillment of the Jewish prophecies, and thus fulfilling his role as the Messiah when he sacrificed himself. Thus, he actually suffered on the cross (but sustained himself just on the edge of death with his self-healing powers), and then afterwards revived himself and actually imparted his powers literally from himself to his disciples through relics.
When he had imparted many of his powers to the disciples through relics (or perhaps made the disciples themselves into relics), he flew straight up, in the belief that as the greatest dynamic, he would be accepted by Yahweh as the ruler of the world. So essentially he sent himself to outer space and thus died.
Because the apostles themselves were not originally dynamics, the power died with them (which would make sense if the dynamic Jesus turned their bodies into the actual relic - which may or may not fit with our scheme of dyno powers...I don't remember for sure), this explains why they could perform miracles, but those who came after them did not have those powers.
But anyway, this is still very soft and mushy in the exact details. I just think this is a tremendous opportunity for us to deal with a real-world accusation that would be brought against Christianity if there really were dynamics.
The hard thing is that this Dynamic Jesus Theory works too perfectly, and we're left with a distinction without a difference, I think, if we say that modern-day dynamics aren't performing miracles when they do what would be called a miracle if it had been performed by a prophet or by Jesus in the Bible. The critic would say: "What's the difference?"
In the externals, there's not really a difference of kind between superheroes and miracles. With Jesus, there is a difference in degree, granted, but who is to say that out of all of history, there couldn't be one single instance of an 'all-powerful' dynamic?
What we
could do, although I am very hesitant to even propose this, is to say that the apostles and prophets who performed miracles in the Bible
were dynamics. However, they only used their powers at the express permission and command of God, knowing that the power they held was more a liability then an asset, as it gave them tremendous power over the world and thus tremendous power to influence the world according to their finite understanding and will, and also gave them the potential to become worshiped.
This would put them in direct contrast to the dynamics of ancient Greece, who used their powers as they wished and demanded/accepted worship, eventually becoming the commonly known members of the Pantheon, and other figures of legend (ie. Hercules).
Why Jesus chose dynamics for His disciples would be to firmly establish His church through the means of His servants using their power only as and when He saw fit for them to use it.
However, in this potential theory, Jesus would in no way be a dynamic. As God, He more than proved himself far more powerful than any other dynamic - demonstrating power over
all the elements, multiplying matter (feeding of the 5,000), and finally, defeating death itself, which no other dynamic has or could ever do. (Biblical examples like Elijah raising someone from the dead would not be a dynamic at work, but God at work through one of His prophets.)
Thus part of the point of all of His many miracles would be to differentiate Himself from all dynamics as the all-powerful One from whom they ultimately got their power.
The descending of the Holy Spirit, in this potential theory, would, among other theological ramifications, give them the ability to know exactly when and how God wanted them to use their dynamic abilities in His service to establish His church. As before, all instances of resurrection would not be a result of dynamic power, but of God working through one of His servants.
That is a
possibility that I hesitate to offer because it does mess with the Scriptures, but not, I believe, in any vital way. To me, this makes a lot of sense and preserves the Christianity and doctrinal soundness of the Scriptures while changing it to fit this universe that is definitely not the real world. The question that I'm asking at this point is: "Is it okay to change the irl Bible so it fits the facts of a secondary world, as long as you don't mess with doctrine...??? Because if God had created a different world, and there were Scriptures given to that world, they would be different from the Scripture we have, right? So it is fine to represent that difference in a world that we have made up??
I know 'changing the Scriptures' is not something I myself am entirely comfortable with, and I know many other Christians share that concern, and this suggestion might just make more problems than it fixes. So I'm just throwing this out there for possible consideration.
On the other hand, I don't have any other answers to this dilemma at present. I don't know how we should or can differentiate between miracles and dynamic powers. I honestly don't know if there is a way we
can logically differentiate between them. That itself is why some Christians don't like superheroes.....because we're giving people basically supernatural powers and yet they're not from God.
But anyway, I am (as I'm sure you can tell) very intrigued with this whole aspect of worldbuilding as it relates to creating a distinctly Christian superhero universe.

Areth,
Ka