Hi, God is unique as he has created various kinds of life in the universe since there is no other universe. The reason why different religions have several concepts to describe the uniqueness for God is because religion is performed by people and that is how they wish to worship God. As if the human view is like different experimental ways for worshiping God as the ultimate quest for creating so many different versions. Many religions give solace to people and help them define the way the want to believe in God. But there can only be one true faith in which to worship God.
When Jesus Christ preached, he explained to the crowds that not everyone will get into the kingdom, Matthew 7:21–23. God himself is unique in creating life in the universe but there is only one universe not alternative universe. But yet people do believe in this idea, such as a parallel universe accessed by a portal. In the dictionary the world Parallel Universe is defined as: A parallel universe, also known as an alternate universe, or alternate reality, is a hypothetical self-contained plane of existence, co-existing with one's own. The sum of all potential parallel universes that constitute reality is often called a “multiverse". In recalling to words of the Lord Jesus we can only hold fast to what is recorded in the Bible. In spite of the many different churches that exist today in our modern world, the picture below expresses well the true belief of all Christians everywhere: