Is the idea of God as an old man in the sky intrinsically ridiculous? If you think so: why?
What do You think about bodies - because there is so much confusion and incoherence on the subject that you probably need to think this through for yourself.
What is wrong with bodies? Well, in the first place, our mortal bodies are subject to change - to decay, disease and death; so our mortal bodies as-they-are can be only a temporary solution; and should indeed be seen mainly as transient vehicles desgned to provide changing experiences to enhance the possibilties for learning.
But what about everlasting bodies? That is a different matter... yet there is a strong and wide-spread religious aversion even to this idea - the idea of resurrection.
Those who crave the spiritual, and oneness (including some who self-identify as Christians), dislike bodies and hope to become pure spirits. Oneness is only possible without boundaries - so that every-thing can merge to one - and bodies are all about boundaries.
Oneness-seekers love that which is name-less and form-less - and therefore implicitly reject Christianity; which is all about a specific person (the Christ), with a specific name (the name of Jesus); who was a man, had the body of a man; and what is more, Jesus was resurrected to have a man's form for all of eternity.
An eternal body implies eternal boundary... eternal separation, autonomy and agency. Since Jesus asks us to follow him through these transformations; this implies there will be an eternity of many persons-with bodies - and Not of boundary-less one-ness...
Since Christians regard Jesus as divine and he is eternally incarnated with an indestructible body; then the idea that Jesus's Father (God the Creator) also has a body should not be regarded as silly or blasphemous! It is, on the contrary, both a plausible and coherent inference.
But bounded bodies imply a physical location; and a Heaven of eternally alive persons is not found on earth; so it must beelsewhere: 'in the sky'.
In other words; if you are a Christian, you should be careful about adopting spiritual-oneness beliefs that are incompatible with the bodily resurrection of Jesus and of our-selves. We need to think of ourselves as - ultimately - embodied eternally.
And if you are a Christian; it is also worth considering the implications of resurrection: what this fact implies about Heaven, its inhabitants and locations - and the nature of life in Heaven. Because - from the fact of resurrection, Heavenly life must surely be a kind of being involving separate, incarnate, embodied individual persons.
In sum; the only thing genuinely wrong about the supposedly ridiculous (because 'anthropomorphic') idea of God the creator as an Old Man in the Sky - is that God is not necessarily old-looking, and God may not be solitary and a man.