Of course it is and its natural to feel that way. Sometimes it actually depends. If you have been attached to your christanity for so long and you had left it for another religion, you might feel some sort of guilt or personal-betrayal. Although, it should fade as time passes on. You still can connect to Christians as you are a theist and you know there is a higher deity. As long as you have that in common with many other religions, there should be no nervousness.

You're old religion has many "rears"? I don't think I've heard of that branch of Christianity. Do they sing "Baby got back" instead of the traditional hymns? ;)

Yes it's normal. But your reasons for changing religions is shady. You say Christianity is pagan...but Judaism is just as pagan. I gave you many sources of this in an argument a while ago.

Yes it is normal to be nervous and even scared, change isn't easy when all your life you were told to be and think one way.

Me personally I went though depression, anxiety for many years after when I stated to question my faith and realized I was no longer a believer, I felt lost, it will get easier and in time you will be allot happier for following you heart on what you believe is truth.

It doesn't happen to everyone, but yes, it is common to feel nervous after leaving a religion.

Abraham was a schizophrenical physco who heard voices telling him to cut his dick off and kill his son... really nice guy to follow..

I converted to Islam within a year of leaving the Buddhist Temple where I'd lived for several years. Yes, it's normal to feel some amount of anxiety after switching religions. But you'll likely feel this same level of anxiety if you reverted back again to Christianity.

I didn't think Judaism accepted conversion?