This is what I personally see as the arguments of both sides (some maybe just my interpretations and some maybe/are my own additions
and not all atheists and creationists are assumed would agree to all the listed statements about them):
There is no God because there is no scientific proof of God.
We think science can explain everything w/o any need for any God.
We don't claim we can explain everything scientifically currently but we trust only what science discovers.
Our current science is vast and it explains (almost?) everything w/o any need for any god.
Creationism says humankind started after God created Adam and Eve
but we proved humankind is created through a natural process called Evolution of Species, as well as all life on Earth.
We think there is an almost certain chance of other life in the Universe and we are currently searching for it better and better everyday.
And if there was any proof of God then we would accept existence of God (and we would also follow orders/wishes of that proven God?)
Or we think if exists God could be good or bad.
We don't want to follow orders/wishes of any proven God?
Or we would follow only if we decide (as whole humanity or individually?) God is good?
We think a world/Universe without God is better than any with God?
If God was created us (and keeping us in existence constantly or just watching us from far away?),
do we accept that God would have a right to do anything with us?
Do we accept that God could judge us and reward and/or punish us with perfect justice?
Or we don't care God does justice or injustice?
Is apparent widespread injustice in world history and today can be seen as a proof of non-existence of God?
If God existed God could have any valid excuse for disasters, diseases, parasites, wars, poverty, slavery, crime?
Or do we think justice is a meaningless human invention; but it is useful for law and order in human social life?
If justice is important, is justice is absolute or relative?
(Apparently relative in the real world because of different laws/punishments/rewards from country to country at least.
Is this reality means all laws of justice are relative and open to interpretation?
Or is it just means justice is absolute and universal but humankind is not there yet?
Or major laws are absolute and minor laws are relative?)
Search for alien life was going on for many decades and there is still no proof of any kind.
How long search for alien life could/should/must continue until an answer is found/decided?
There is no scientific proof for how life started on this planet.
There are just a bunch of unproven conjectures.
We don't think Theory of Evolution is really proven.
(One time an atheist was saying yes there is no absolute proof for evolution
but there are lots of signs pointing towards it.
(I don't know what percentage of atheists would agree to that statement)).
We think the extremely (very complex) mathematical, and clearly very precisely adjusted nature of the Universe
(like constants of physics, perfect for life properties of Sun, Earth etc.),
laws of physics, chemistry, biology (extremely complex and advanced structures and functions of living organisms
are all signs (proofs?) of existence of God.
Also we think humans are clearly very distinct from all animals (way more distinct than the difference between any other animals)
(What is that great difference? How about way more intelligence, knowledge and abilities?
Whose cities, roads, vehicles, dams, etc covering this planet?)
Where all the energy to create the Universe in the Big Bang came from?
We don't see any really contrary proof in science about about God (as we reject the offered proof(s) for Theory of Evolution).
We believe God sent us many prophets to show a better way of life.
We think God is testing humankind for who deserves rewards in Heaven and who deserves punishments in Hell and we accept judgement of God.
If we could choose between living in a Universe with God or without God, we would choose Universe with God.
Universe with God is required for providing perfect justice to all humans and all living creatures ever lived, living, will live.
Humans can never achieve perfect justice for neither themselves nor any other living species,
no matter how technologically and ethically advanced.
Can have life any meaning w/o God?
Science says Universe and life will certainly die someday.
Are the lives and accomplishments, discoveries, inventions, artworks, faith, selfless acts of anyone in history
deserve rewards from God, more rewards than humanity did provide?
There is no absolute scientific proof of God but science is also unable to prove God cannot exists theoretically.
Then isn't it believing in God is better? What we lose/win if we believe?
If a particular religion seems wrong or inconsistent, is that mean all religions are?
How many atheists really know and understand all world religions in detail to fairly judge them as wholly/partially right or wrong?
If Theory of Evolution is right then why we don't see way more variety between individuals of a species?
(Where are humans with four arms, giants, tiny humans, humans with eye(s) in the front and back, etc?)
Why we even have distinct species?
Living very close together under similar conditions for millions of years but unable to have viable offspring?
Why we don't see half-human half ape (Big Foot?) living today?
How come some species can stay unchanged for hundreds of millions of years?
Isn't it obvious for example, fruits were created for human consumption?
Animals really need them?
Also isn't it spending so much energy to make fruits is a smart choice for plants?
Because there are also many other plant species don't produce fruits and thus save much energy.
Except for (large/many) fruits, plants seem to be using energy extremely efficiently.