The phrase "affirming that I" is correct and usable in written English.
It can be used when you want to express agreement or confirmation regarding a statement or belief you hold.
Example: "I am affirming that I believe in the importance of education for all."
Alternatives: "confirming that I" or "asserting that I".
Since I accepted my ethnic identity, I have gone from seeing Gypsies as strangers and convincing myself that "I have nothing in common with those people" to affirming that I am "one of them".
When I filled out the application to serve as your scoutmaster, I answered honestly and fully in the section about religious beliefs and affiliations, affirming that I had a deep faith in a tripartite divinity — Father, Son, and Holy Spirit.
It was still there, albeit a bit wilted, when I confidently signed the customs declaration, affirming that I wasn't attempting to bring any fresh produce or plant material into the United States.
But it doesn't matter how positive the marriage equality conversation around me is: the reality is I'm still constantly listening to people affirm my right to be treated the same as others, which feels an awful lot like people affirming that I'm human.
Not only that, but it gave me a sense of accomplishment and confidence, affirming that, yes, I am capable of doing this.
We affirm that I am still alive and still a citizen.
What it meant, apparently, is that so-and-so had affirmed that I do indeed possess the skills that my profile claims I have.
I affirm that I will not plagiarize, use unauthorized materials, or give or receive illegitimate help on assignments, papers, or examinations.
"At a certain point, I've just concluded that for me personally it is important for me to go ahead and affirm that I think same-sex couples should be able to get married," Mr. Obama said.
He told ABC News: At a certain point, I've just concluded that for me personally it is important for me to go ahead and affirm that I think same-sex couples should be able to get married.
"I've just concluded that for me personally it is important for me to go ahead and affirm that I think same sex couples should be able to get married," he said in an interview with ABC News.
