As usual Mephster is much more talented with explaining things than I am.
In regards to Tawhid and the Oneness of G-D (Allah)mentioned earlier, this concept of Tawhid is important withing Judaism as well.
As a former Christian (both Roman Catholic and 'born-again' for many, many years), and now as a Muslim, one of the problems I have with Christianity which eventually led to me leaving is that I do not see it as a 'fullfillment of the law' as Jesus (as) quite clearily says in scripture that he came to do;
Mntion was made of the fact that Judaic teaching covers the spiritual, state and government issues that come up within ones life. This is also true of Islam. It is, however, not true of the Christianity that has been taught (now or in the past). The teachings are of a spiritual nature only. State and Government issues must be taken care of in a separate manner.
If you spend some open-minded time studying both Judaism (Orthodox[as in original]) as well as Islam you may come to see this. They (Judaism and Islam) are more 'ways of life' rather than 'religions'..
And, in my mind makes them more appropriate choices to live by.
Insha'Allah, I have not said anything incorrect.
Takbir!!!