Stongest argument for your belief The most convincing way to me is to come up with a plausible definition of 'God' that has a referent.
Definition:
'God' refers to that which is:
unified and continuous (not made of parts),
eternal (not in the sense of infinite time, but in the sense of non-temporal, absolute simultaneity),
omnipresent (spatially everywhere, i.e. is space),
omniscient (not in the sense of knowing the set of all facts but in the sense of an omnipresent conscious substance aware of its behaviours)
omnipotent (not in the sense of being able to perform any act described in any random sentence with a verb (e.g. kill something that's dead), but in the sense that there is no power which is not God's. All existing things are relatively stable behaviour-patters of God's body. This power to self-move, do Big Bangs, create particles which then persist seemingly autonomously, is God's omnipotence.)
Objection1: Why on earth call that 'God'? That's just the universe, or reality.
Answer: Because the universe or reality is not commonly considered to be conscious and intentional. This definition makes that explicit. Surely a conscious universe is about as Goddish as you can get, but I'm not bothered if you don't want to call it 'God', especially if you want to avoid a whole lot of other false and pernicious baggage that often goes with the word.
But consciousness emerged late in the history of the universe.
This is the big substantive question that cannot be solved by making a definition. No, it didn't, in my view. Consciousness is not emergent. Panpsychism is true. See every other post on the forum I have ever made ad nauseum.
Objection2 Even if I agree with this definition and that the universe is conscious, I still don't see what this has got to do with the Torah, the New Testament, the Koran, and all the holy texts and creation myths of any religion that espouses a creator God consistent with your definition. Nor do I see why such belief means we should hate fags, suicide bomb people and deny evolution.
Answer: That's all fair enough. As far as holy texts and creation myths are concerned, there tends to be very little metaphysical commitments in them (unless you take them literally of course, which would be foolish). The reason I might want to maintain a connection between such texts and a belief in the conscious reality defined above is that I think it might be the case that such stories contain subjective metaphorical accounts of what it feels like to create an universe, and may provide insights into the relationship between the creator and the created and the intentions behind such actions. Science is clearly much better placed to provide an objective non-metaphorical account of the physical details of what happens, but it is silent on what it feels like to be the substance undergoing those processes. There are no characters or drama in physics, and as such it is incomplete.
Also, I have no problem with cherry-picking. Just because I find one bit of the Bible edifying, I don't have to swallow the lot.
In summary, this approach is defining God as the reality-as-continuum we already know.