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I am an ex-Christian.

I am an atheist.

I do not "know" that there is no God (except in cases where the properties attributed to the God are logically inconsistent). I simply do not hold to any theistic belief that one exists.

Atheism is a retronymic philosophical classification.

Theism is belief in a God or gods (there are many subsets of this category). If you do not have a belief in a God or gods you are an implicit (or weak) atheist. A subset of implicit atheists are explicit (or strong) atheists. Explicit atheists, whilst not holding a belief in a God or gods extend this to state that a God or gods do not exist. All other beliefs regarding supernaturalism are irrelevent to these categories.

A further classification are Metaphysical (or ontological) naturalists. MN's hold a monistic belief that the natural is all that exists.

All metaphysical naturalists are explicit atheists.

Not all explicit atheists are metaphysical naturalists.

All explicit atheists are implicit atheists.

Not all implicit atheists are explicit atheists.

Agnostcism and gnosticism are statements on "confidence of knowledge" not belief.

This means that I am a gnostic atheist with respect to God claims where the properties assigned to the God are logically inconsistent. I am also an agnostic atheist with regards to God claims which are simply irresolvable.

All of the evidence indicates that the universe is approx 13.7B yrs old, solar system approx 4.5B yrs old, life originated (Abiogenesis) on this planet approx 3.5B years ago and a dynamic process called evolution has resulted in an incredible diversity of life on this planet including us.

Young earth creationism is a scam with particular organisations making millions by preying on the ignorance of the scientific illiterate. The scale of their error regarding the age of the universe is the same magnitude as saying the circumference of the Earth at the equator is 17.5 metres.

Intelligent Design is nothing but an appeal to ignorance (We don't understand how .... so it must have been a designer).

People who say that science has disproved the possible existence of all the various claims of a God or gods are not making this claim from a scientific standing. Science can be used to falsify specific fact claims such as the universe is approximately 6,000 years old or there are no transitional fossils and logic can refute the existence of a God who is described as possessing logically inconsistent properties such as being both perfect "and" requiring your worship.

Science can never prove or disprove the existence of God. It can only look at evidence to either support or falsify the specific God concept being proposed.

Proof is the realm of mathematics. Science is bound by methodological naturalism which cannot comment on the existence or non-existence of the supernatural. Methodological naturalism, which is a process, is not philosophical naturalism, a belief.

I lack a belief in a God or gods.