Baha'u'llah was impacted by Christian ideas and contacts with European missionaries

Impacted by Christian ideas and contacts with European missionaries, Bahá’u’lláh became increasingly charmed by Western conceptions (Abassy 2010, pp. 90–91; MacEoin 1983, p. 227). While staying in Edirne, Bahá began to create the Kitáb-i-Aqdas (Arabic: الکِتَاب الأقدَس; the Most Holy Book). This, the Bahá’í Faith’s most important scripture, was an amalgamation of modified Báb postulations filled by the new doctrines from Bahá’u’lláh.

(Transition, Emulation and Dispute over Authority in the Bábí/Bahá’í Faith by Siarhei A. Anoshka)

https://www.mdpi.com/2077-1444/15/5/577