Here is a list of institutions holding religious services on Sundays. Services take place at the institution unless otherwise stated on their website.
St Peter's Anglican Church - www.saintpetersanglican.org/
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Hope International Church - www.hopeic.org/
First Parish Waltham Unitarian-Universalist - www.walthamuu.org/
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Sacred Heart Catholic Church - sacredheart311.com
The Parish of St. Mary's - www.stmarywaltham.org
Lakeview Congregational Church - www.lakeviewcongregationalchurch.com
First Baptist Church of Waltham - www.fbc-waltham.org/
St. Jude Church - www.rc.net/boston/st-jude/page1.htm
New Covenant Church of Cambridge - www.newcovwaltham.org/
Trinity Church - waltham-trinitychurch.org
Christ Church Episcopal - www.christchurchwaltham.org/
Immanuel United methodist Church - www.gbgm-umc.org/immanuel-waltham/
First Presbyterian Church of Waltham - www.fpcwaltham.org
St. Charles Borromeo - http://www.stcharleswaltham.4lpi.com
Beth Eden Baptist Church - www.bethedenbaptist.org/
First Lutheran Church of Waltham - www.luther95.com/FELC-WMA/
Our Lady Comforter of the Afflicted - www.olca.org