No, Al Pacino did not say this.
The comedian Emo Philips claims it as his own in a Guardian Article from September 2005 entitled "The best god joke ever" (Incidentally, the title does not claim the quoted joke as the best God joke ever)
[...] possible effect if the British government goes ahead with its intention to outlaw "offensive" religious jokes [...] So I hope the ban never goes into effect. But in case it does, I had better seize this last glorious moment to tell the rest of my religious jokes. Here goes:
- When I was a kid, I used to pray every night for a new bike. Then I realised, the Lord doesn't work that way. So I just stole one and asked Him to forgive me ... and I got it!
This was originally said as part of a show, reported as from 1985 and can be viewed on youtube. Commedians are usually careful to not rip-off someone elses jokes, so it is safe to assume this was his own material.