Christianity is not the most comfortable belief and is not speculation (even if many other religions are speculation) it is a revelation.
It
claims to be revealed, as do many other religions, but claims do not reality make.
As general knowledge increased, a lot of these revelations were revealed to be incorrect.
There is speculation in science, and because of the assumptions of science the speculations are limited only to the naturalistic ones. The claims are made therefore in a general sense already.
The hard sciences are pretty specific and well documented, and any general claims remain hypothetical till further evidence comes to light.
A corollary of modern atheism is that the naturalistic answers of science are the only answers worth having.
They are the best explanations we have, given current knowledge, but it's worth noting that questions of ethics, morality, meaning and purpose are not within science's purview. It leaves these to religion.
Now if only religion would leave claims of physics, chemistry, biology, &c to science....
This sort of atheism is comfortable for people who do not want to be bothered about a God.
I don't think not wanting to be bothered with god is what motivates most atheists. Most of us are atheists by default. We were born that way, so to speak. Many of us
are interested in religion, and are pretty knowledgeable about it, but we see no convincing evidence supporting it.
You can make up your own right and wrong and have an excuse to put before God if He is true. (You did not give us empirical evidence so how do you expect us to believe, it's your fault God)
Now that's just silly. I suppose you blame leprechauns and pink unicorns for your lack of belief in them.
Your speculation and faith is the world view that puts humanity as the pinnacle of everything.
When did we arrive there?