EKKLESIA
The company is called "EKKLESIA" which is a greek word which means an "assembly of citizens" but which also gave the word "church". The company will offer online theological training, sell theological books, but also church consulting and communication advices for secular organizations that might be in contact with christians. The logo might inspire trust and put the emphasis on advice and training. You can try to use symbols that represent the company, like light for knowledge, owl for wisdom, a fish for christianity, a growing tree, a house under construction... I don't want something purely religious.