I rememebr the film Stigmata, the character played by Gabriel Byrne (?) was a forensic scientist but joined the Catholic Church and worked in the Vatican.
As a Scientist he had become so overwhelmed with how fantastic the world was, how amazing life was and therefore came to the conclusion that there HAD to be a God, because all this around us simply could not have happened by accident.
I know it's only a film, but it makes a lot of sense.
So my answer, Yes there must be a God, whether the various religions around the world have the details right, I don't think so somehow.
I find that the old the universe is too complicated to not have been made by God argument has one huge drawback.
If that is the case then how come god has no creator? Surely he must be more complex than the universe he created and therefore following the argument can't just "be" ,so therefore he must have had a creator, who must also have had a creator and so ad infinitum.
It depends what you mean by God. I reckon it's more a case of positive life-bringing energy and negative destructive energy, rather than an omnipotent being.
It's quite hard to be serious about this question - I always think of Alan Partridge's quote:
The question of who made God can be answered by simply looking at apace and asking, "Does space have an end?" Obviously it doesn't. If there is a brick wall with "the end" written on it, the question arises, "What is behind the brick wall?" Strain the mind though it may, we have to believe (have faith) that space has no begininng and no end. The same applies with God. He has no beginning and no end. He is eternal.
Time is a dimension God created, into which man has been subjected. God dwells outside this dimension that He created. He dwells in eternity and is not subject to time. God spoke history before it came into time. Because we live in the dimension of time, logic and reason demand that everything must have a beginning and an end. We can understand the concept of God's eternal nature the way we understand the concept of space having no beginning and end- by faith. we simply HAVE to believe they are so, even though such thoughts put a strain on our distinctly insufficient cerebrum!!!!
Hope this makes sense....SURELY THIS IS EASIER TO BELIEVE THAN THE THEORY THAT HUMANS, (COMPLEX ORGANISMS WITH THE ABILITY TO UNDERSTAND IDEAS SUCH AS TRUTH, JUSTICE, HOLINESS ETC) EVOLVED BY CHANCE FROM POND LIFE?!