If it does not affect the workplace, can my boss not force me to work during the hours my Church functions for worship?

The law protects employees from discrimination based upon their religion.  In most cases, an employer is required to permit its employees to observe religious holidays and events.  However, in some cases doing so would create a significant hardship for the employer.  I don't really have enough information here to give you any guidance as to whether your particular religious practices would create such a hardship for your employer, so I'd suggest you check with your local civil rights commission or human rights commission.