Baha’is believe God is one… but there is a perspective on the Trinity that was shared by Abdul-Baha…
*The epitome of the discourse is that the Reality of Christ was a clear mirror, and the Sun of Reality – that is to say, the Essence of Oneness, with its infinite perfections and attributes – became visible in the mirror. The meaning is not that the Sun, which is the Essence of the Divinity, became divided and multiplied – for the Sun is one – but it appeared in the mirror. This is why Christ said, “The Father is in the Son,” meaning that the Sun is visible and manifest in this mirror.
The Holy Spirit is the Bounty of God which becomes visible and evident in the Reality of Christ. The Sonship station is the heart of Christ, and the Holy Spirit is the station of the spirit of Christ. Hence it has become certain and proved that the Essence of Divinity is absolutely unique and has no equal, no likeness, no equivalent.
~ Abdu’l-Baha, Some Answered Questions, p. 113
As to love…we believe there are four kinds of love… The love of God for the creation (humnaity)… The love of humanity for God… The love of man for man… and the love of God for the Image of God…
Love is only of the four kinds that I have explained. (a) The love of God towards the identity of God. Christ has said God is Love. (b) The love of God for His children – for His servants. © The love of man for God and (d) the love of man for man. These four kinds of love originate from God. These are rays from the Sun of Reality; these are the Breathings of the Holy Spirit; these are the Signs of the Reality
~ Abdu'l-Baha, Paris Talks, p. 181