in my opinion, u cant practise buddhism and judaism at the same time, but you can practise buddhism as your way of life while you are still living with and identity of a jew, whereby still practising jewish traditions and following jewish law, provided it does not clash the core concept of buddhism -- causing no harm on yourself and others (all sentient beings).
there are some stories whereby some jains (follower of jainism) wanted to become buddhists but buddha advice them to remain their identity as a jain but practising the teaching of buddha. Buddha prioritize harmony in the society, if practising buddhism makes one suffer and leads to quarrel in family, then it brings suffer. Buddha's teaching should bring happiness, joy, freedom and peace but not suffering, harm and disharmony.
i want to share a story with you here, a young man called sigalaka worship the six directions as urged by his father, the buddha saw it and told him:
"Mother and father as the east,
Teachers as the south,
Spouse and family as the west,
Friends and colleagues as the north,
Servants and workers below,
Brahmans and ascetics above;
These directions a person should honor
In order to be truly good.
you can refer herehttp://www.accesstoinsight.org/tipitaka ... .ksw0.html
brahman and ascetics can be refered as rabbi in today's context in jewish community, you have to honour them also although you want to practise buddhism. traditions have been handed down by many generations, and the traditions all have meaning, but after long long time, people tend to forget the reason of doing that tradition and therefore only doing the traditions blindedly, without interpreting its meaning. so as a jewish buddhist, it can be quite interesting to continue practising the traditions of the jews but interpret it in a way that can bring joy to you and other beings. becoming a good buddhist can make your mind clear and be able to see many things in a more neutral way rather than a fanatic way. below are some guidelines of how a human should think and believe.
"Believe nothing, no matter where you read it or who has said it, not even if I have said it, unless it agrees with your own reason and your own common sense.” – Buddha
"First, rely on the spirit and meaning of the teachings, not on the words;
Second, rely on the teachings, not on the personality of the teacher;
Third, rely on real wisdom, not superficial interpretation;
And fourth, rely on the essence of your pure Wisdom Mind, not on judgmental perceptions." by buddha
"Do not believe in anything simply because you have heard it. Do not believe in anything simply because it is spoken and rumored by many. Do not believe in anything simply because it is found written in your religious books. Do not believe in anything merely on the authority of your teachers and elders. Do not believe in traditions because they have been handed down for many generations. But after observation and analysis, when you find that anything agrees with reason and is conducive to the good and benefit of one and all, then accept it and live up to it.” by Buddha
if you can think in such a way, for sure, there is no problem for you to be a skillful jewish buddhist.
i am not a jewish buddhist, i am a buddhist from malaysia. hope my advice can give u an unbiased point of view and can help you.