Hey trjones.
First of all, to answer your question, yes. This is my personal opinion, that both Christ and the Buddha are examples of fully enlightened beings. Also, as we have discussed in a
recent thread, a useful way to deepen our understanding of the one or the other is to apply the concepts of the opposite.
Now, having said that, to formulate a deeper answer to your question is challenging. This is because it requires an amount of study that can only take place over a long period of time.
To start, there are many ways to discern who is enlightened and who is not. As Jhananda argues, critical are the 8 stages of the religious experience, or jhanas. Also important to Jhananda's view are the superior fruit of attainment: the maha-phala, or siddhis.
Are there other ways to discern who is enlightened? In orthodox Buddhism, they argue for the 7 marks of the arahant: mindfulness, discriminative wisdom, energy, joy, tranquility, equanimity, and samadhi. Orthodox Buddhism also argues in favor of the
4 Noble Ones, the implication being that an enlightened being would have progressed through each of these stages on his way to perfection.
In the theology of St. John of the Cross, critical are the navigation of two spiritual crises. The first we could call "metanoia." The second we could call the "dark night of the soul." I will try not to explain these, because I have only understood them by direct experience.
In
one thread, we explored the book
Cosmic Consciousness which R. M. Bucke published in 1901. In this book he looked at a large number of figures from history, including the Buddha, Christ, Dante, Walt Whitman, and Mohammed, and argued for a comprehensive concept about them, their illumination, and attainments.
In
another thread, we discussed Sri Ramana Maharshi. Although initially we found only evidence of nondualism, evidence of the 2 spiritual crises and the superior fruit of attainment point to his being an arahant.
Finally we have had other discussions trying to understand the spiritual life in Christian language. In my opinion, an important Christian doctrine to learn if you're interested in mysticism is the doctrine of
theosis. According to this, "God became man so that men can become gods." In other words, like Christ was both divine and human, so, too, can all men develop these two natures, and arrive at perfection by the imitation of Christ.