I feel kind of uncomfortable going to counseling

[Der/die AtheistIn]

I'd imagine that if you go in for psychological counseling, and get proselytized at, licenses could be lost, unless the person has advertised religious counseling as part of their methodology.

"Oh, you're suicidal?  Have you accepted Jesus as your Lord and personal Savior?  Cuz if not. . . suicide is the least of your worries."  This should trigger almost instant loss of career IMO.

I think very real harm is done to minors-- because religious parents can selectively choose this kind of counseling, and do permanent psychological harm, and there's not really that much the government can do about it.

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I wouldn't say that.

There are unfortunately plenty of theists who try to pass themselves off as lagit therapists. "Gay conversion" bullshit is widely sold by religious frauds.

I would say it is certainly possible to find secular therapist, even if they have a personal religion, who is willing to leave it at the door.

But I agree, if they push religion, after you ask them not to, hit the door, don't look back, seek someone else.

Yep, all they have to do is find a word that isn't specifically covered in licensing-- instead of "therapist," call it "life counseling" or whatever.  (I don't know the exact terms, but that's the idea)

Then you can have some BS institution pumping out bullshit certificates for their flavor of counseling: "wholistic life counseling therapy consultant" or whatever.

Don't worry, it's Counseling from my college.

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I expressed my anger towards one of my parents mistakes multiple times. My anger has become serious, so I made an appointment for counseling. The problem is, I don't feel comfortable talking about this particular subject to my therapist. 
My parents' mistake has to do with religion, but I don't want counseling for my disagreement with religion. Yeah, religion makes me sometimes angry, but not to the point where I have problems controlling myself. I also don't fear being judged for my atheism on a regular basis. I don't know if my therapist is religious or not, and as much as I complained about religious in the past - including moderates - I won't mind my counselor being religious. All that I want from him is that he does his job right. I don't want to discuss with my therapist whenever religion is good or bad or how to live as an atheist, I just want to discuss with him about the fact that I was brainwashed by fundamentalists for almost a decade right under my parents noses, and when they found out they didn't understand how bad the situation was.
Here in Europe people are usually more indifferent towards other religions and atheism and most christians are moderates. But part of me still fears that my therapist might want to convince me to return to my religion. 
Also, I never talked directly to someone about my parents' mistake. The most I did was writing on this forum where nobody knows my real name. I know that the counselor will keep my secret and I met him before, I highly doubt that he'll judge me, but I still feel very uncomfortable talking to him about this.
What should I do?

Um,.......... that might not be how it goes. I know you think that's the only issue that needs to be addressed, but my intuition (based on your past posts) tells me that you have other issues that also need to be addressed. 

Convinced to return to religion?? Only if some part of you wants to be.

What are the other issues you're referring to?
And I was fearing that he might try convincing me, not because I want to return, which I won't, but because I feared he might end up being a bad counselor and I have to find another and let my mental issues aside for longer.