I feel it is important that the TRUTH be told about extraterrestrials otherwise we will continue to be confused an inappropriate as we have been apparently since life began.
Defining "life" tells me there is the possibility that there exists infinite forms of life.
Therefore I find it very likely, that life on other planets can be in forms we don't recognize...
Then sure... there is life on Mars.
there may be other life forms in this universe but perhaps they would be inter-dementional beings, as to just our biological make up and that have a greater freedom of movement than we do in this 3 D world and these beings would be able to move back and forth in time and space with ease. A demention where all points in space are equal to all other points in space so to say something is here or there would make no sense. I think we should not rule out inter-dementional beings and just look only for biological being such as ourselved. The Biblle calls some of these beings Angels and describes different orders of Anglels like in a heirachy . In most ancient religions there is a reference to these type of beings in the universe
I suppose my answer is based on the fairly simplistic premise that if I have no available evidence to incline me to believe there IS life on Mars, then the hard-wiring that manages my thinking forces me into the belief that there is no life on Mars. However, I do remain always at the ready to shift my belief regarding life on Mars (as I am with pretty much everything) by varying degrees, right up to and including 100% certainty -- to the point of becoming & being yet another incarnation of Eric Hoffer's "True Believer", with all the rights, privileges, and self-righteous indignation thereunto appertaining.