I think secularism ignores god while atheism denies the existence of god.

It's semantics. Who cares?

Google them both.

Look it up. Dictionary.com is your friend.

Atheism

1. the doctrine or belief that there is no God.

2. disbelief in the existence of a supreme being or beings.

Secularism

1. secular spirit or tendency, especially a system of political or social philosophy that rejects all forms of religious faith and worship.

2. the view that public education and other matters of civil policy should be conducted without the introduction of a religious element.

Secularism is not part of atheism. They are two separate things. Not all atheist are secularest, and not all secularist are atheist.

They are separate. An example: There are some religious families that homeschool yet use secular material. They might be a blended faith family. This does not in itself make them an atheist. As an atheist homeschool mom myself I can't stand when these "secular" types point out neutral resources. Yes there is a difference.

I would suggest it quite natural for an atheist, who is someone who lives their life without religion to support secularism, keeping religion out of government. Not entirely a necessary consequence of atheism but understandably common. However Atheism isn't a requirement for secularism. The founding fathers of the USA included people very religious in their own way but with good reason to be cautious about the establishment of state sponsored religious practices. Non secular states can be as cruel to to other faiths as to those without faith.

Secularism is the principle of separation of the state from religious institutions. It is quite separate from atheism, and there are many religious people who are also proponents of secularism.

Not the same

You can be a theist who practices secularism or adheres to secularism in some aspects of your life. Atheism and secularism are not synonymous.

secularism is, as far as i know, the belief that religion should not be part of government. believers and unbelievers alike can be secularists.

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I really liked the last sentence that proposes the idea that healthcare, education, and justice should all be secular. Secularism on the social level, atheism on the personal choice level...but not necessarily related since, as the articles states, a secular society will protect the civil rights of all, believers and non-believers alike. I doubt very much the same goes for theocratic societies!

I do not believe in god or gods...and I do believe in keeping religion out of government....maybe a distant relative to each other, but I don't see the two things as kissing cousins.

IMO... Secularism is orthogonal to atheism and religion -- the concepts should operate in different directions.

For example the Constitution of the United States apparently intends to be a secular document. It prohibits governmental (its sphere) actions regarding religion -- both for religion and/or against.

Issues come up of course when people disagree with that attitude -- as with the clergy answering for abuse allegations and with church privileges as with tax exemptions.
Nobody says life is simple. Lol.,

Additional: I looked at the article without noticing the organization.
I agree. Thanks for the link -- it looks interesting.