No. I do so because it is the only "reality" I believe in. If I felt that there was another reality beyond this one that would come forth after the cessation of my existence, then that would be essentially equivalent to religious concepts of the afterlife. But I cannot be certain one exists, so given the available information, I live my life in this world as though it is the only one, because it is.
Well then your comment makes no sense to say you don't let your belief in this reality affect you functioning in society, when actually you do, see the bold. So your original comment comes across just as saying that well at least I don't let my beliefs deteriorate my ability to function in society, which presumes that religion actually does that (some do and some don't).
If there is a reasonable explanation for existence of reality and by extension the universe, then the ontological argument infers that such explanation may be found in God. But yes that is if there is need to explain existence; or if there of course sufficient reason which is not necessarily the case.
Available information, I am presuming your scope is limited to scientific data. Do you accept the most plausible, certain explanation of things, or do you just go meh, and the like?
If no, then fine, but I guess you cannot complain about the lack of evidence.
If yes, then there are certain things that might demand an explanation (whether conceivable or not). One of those is the resurrection of Jesus Christ, which Christians celebrate every Easter. It is one of those things, where the evidence is very strong for.
Unless one has some other authority that explicit means that we doubt reason to believe that Jesus indeed died (which is the case in Islam; and in Gnostic/pseudigraphical works). We establish therefore that there is a dead body, and that this dead body is unaccounted for. Kind of like a crime scene investigation.