Greetings!
First of all i'm not from USA but from Milan, Italy so my experience may be quite different.
- Since i am a computer science student whether i will have any problem in my career growth in SAS?
Definetly not.
I work in SAS (among other things) and i'm an industral engineer with some interest in statistics.
From what i've seen CSc, economics or statistician and the most common SAS users.
Also SAS is pretty straightforward and if you did Heavy C you'll find it even quite easy.
- I am ready to learn statistics also, is there anything else I have to do?
Data Management, Datawarehousing and possibly throw in some Project Management skills!
- Doing certification in SAS will make any changes?
It will look good into your resume.
I did take the certification (actually i believe i'm the only one in my country to have scored 100% )and while not learning much i definetly found some good question to ask in an interview :)
Most important part about the certification is it requires you to have experience with SAS and understand how things works, its not a memory based exam.
- Is it a bad idea to get into SAS with only CSc backgrond?
I believe it is a good idea.
As pointed out is a niche with high paying big customers and it can get u better salary than similar programming position.
Also it opens you the possibility to gain experience in all the BI world with competitors (business objects, oracle, microsoft, microstrategy, cognos,ecc ) and quite possibly put you eventually in charge of large projects as a Project Manager.
Good luck!