The concept of parallel universes or multiple dimensions is not explicitly addressed in most traditional Christian teachings or scriptures. As a result, there is no definitive answer within Christian theology regarding whether God has access to parallel universes.
Christianity generally emphasizes the belief in one God who is all-powerful, all-knowing, and omnipresent. God is often described as transcendent and capable of operating beyond the limitations of the physical universe. However, the specific nature of God's interaction with other dimensions or parallel universes is not clearly defined.
Since parallel universes fall within the realm of speculative science and theories like the multiverse, it is a topic that is more often discussed in scientific and philosophical contexts rather than within religious frameworks.
It's important to note that different interpretations and theological perspectives exist within Christianity, so individual believers and theologians may have their own viewpoints on this matter. Some may suggest that God has access to all dimensions and parallel universes, while others may argue that such concepts are beyond human understanding and therefore leave it as a mystery. Ultimately, the question of God's relationship to parallel universes remains open to interpretation within the realm of Christian belief.