Universe

Atheists sometimes object that there is no clear definition of a god/God. Here I want to say very clearly that God cannot be defined, God's attributes can only be described. If God is the creator of the universe, then from this it follows that before creation God was alone and that there was no one else, nothing else other than God. As universe means space, time, matter and energy, so from this it follows that before creation there was no space, no time, no matter and no energy.

When some scientists have given an explanation for the origin of the universe due to quantum energy fluctuation in a void, was it that their sole purpose was just to show how the universe had actually originated? No, they were having one more open agenda and some scientists are still very much vocal about it: they want to send a message to all sorts of superstitious believers all over the world, so that they can forever arise from their dogmatic slumber, that this universe does not need any kind of God in any way.

Some scientists are now saying that the universe is eternal, that it has always existed even before the big bang. Universe in its present form is only 13.8 billion years old, but before that it has existed in some other form. But before the big bang there was no space and no time, because space and time came into existence along with the big bang only. So if the universe was always there even before the big bang, then it was neither in space nor in time, because before the big bang there was no space and no time. Being neither in space nor in time it will thus be spaceless and timeless.

In a debate with Dr. William Lane Craig in March, 2014 theoretical physicist Sean Carroll has said the following in his opening speech:

If you have a universe that obeys the conventional rules of quantum mechanics, has a non-zero energy, and the individual laws of physics are themselves not changing with time, that universe is necessarily eternal. The time parameter in Schrödinger’s equation, telling you how the universe evolves, goes from minus infinity to infinity.1

We are here on earth, because God needs us.

The question 'Why are we here on earth?' can be answered in two steps:
1) First of all we will have to know as to whether there is any God or not;
2) If we can somehow come to know that there is a God, then we can further ask the question as to why he created the universe.

When we will have the answer to this question, we will also come to know as to why the universe exists, why we exist, or why we are here.

The above two have already been answered here1 and here2 respectively.