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Adam only has some Jewish blood, he does not practice the religion in any form.

Adam only said he was Jewish, when people started asking him to do a Christmas album. It was his way of getting out of doing it, he follows no religion, Jewish or otherwise. His mother has some Jewish blood. Adam is a free spirit, and believes in the Universe.

He does some loose ties to his mother's Jewish heritage.. He has performed at several venues for various functions, including these:

The Prayer with Noa Dori at a memorial for Israeli President Yitzhak Rabin in 2005

https://www.youtube.com/watch?v=Bf4s2nW6nYY

The Prayer with Illysia Price in 2005 for Kol Nidre, on the eve of Yom Kippur, a Jewish Holy day..

https://www.youtube.com/watch?v=CYnVGHy9Obo

Chablad (Jewish) Telethon: "Is Anybody Listening?" 2004

https://www.youtube.com/watch?v=VQ--ayeYsI8

And a little snippet of an interview from 2009 "Jewish News: The Jewish Mother Interview"

Jewish News: Hi Adam, nice to meet you.
Adam Lambert: How are you?
JN: How are you?
AL: I’m very good. Thank you.
JN: Well, Adam, welcome to “the Jewish mom” interview.
AL: Yaaayyy! My people. (Laughing and opening his arms wide.)
JN: Speaking of your people, there are some things your Jewish fans are curious about. Are both of your parents Jewish?
AL: No, my mom is.
JN: The Rolling Stone article said you dropped out of Hebrew school at age 5.
AL: I think I was a little bit older than 5. Probably like 9.
JN: How were you able to sing those songs in Hebrew that everyone’s listened to over the Internet?
AL: Oh. All phonetic. I don’t speak Hebrew. I wasn’t bar mitzvahed, unfortunately.
JN: So did your family celebrate the holidays?
AL: We did celebrate Chanukah as opposed to Christmas. So we stayed true to our roots that way. And we celebrated Passover occasionally. I mean I hate to say it, but we were kind of Jewish by form. Lightly Jewish. Diet Jews. More of a heritage thing.

Adam doesn't practice the faith as far as we know, but he does have a few ties here and there...

Adam has called himself "Jewish Lite" in the past. We've also seen pics from his family celebrating Jewish holidays and Sauli's story about celebrating Hanukkah and making latkes.

Adam's Mum is Jewish she does'nt have "some Jewish blood". Also Adam does not celebrate Christmas.

Foot note: In the Jewish religion you are considered Jewish if the mother is Jewish. I guess this goes way back before Dna testing you always knew who the mother was but obviously not the father.

"...kind of Jewish by form..."says it best, his own words [and actually none of our business], imo.