We all know 博德恩, the American missonary to China for Lanzhou and died pre-matured in Cairo. 

https://en.wikipedia.org/wiki/William_Whiting_Borden

The man heavily influenced him was Prof. Samuel Marinus Zwemer 

https://en.wikipedia.org/wiki/Samuel_Marinus_Zwemer

at Princeton Theological Seminary, known for his understanding of Calvinism and Islam:

Zwemer’s theology, following the Calvinism of his parents,^[24] was that he saw the supremacy of God in all things.^[25] The Bible was programatic in his faith and his thinking of his ministry, and emanated in his vocabulary.^[26] He studied Islamic Doctrine of God, initially drawing stark contrasts with the God of the Bible, then nuancing his view over time.^[27] He praised the all encompassing idea of God in Islam, seeing it as the ‘Calvinism of the Orient,’^[28] and even placed the Bismillah on his study wall in Cairo^[29] and on the cover of his journal "The Moslem World". He saw Islam’s grasp of Monotheism as its great strength^[30] and yet also its great deficiency.^[31] For him, without an understanding of the Trinity,^[32] God was unknowable and impersonal.^[33] Hence, he cherished the doctrines of the Incarnation and the Atonement, writing major works on the topics: The Glory of the Manger^[34] and, his favourite,^[35]The Glory of the Cross.^[36] Though a stumbling block for Muslims, he saw them as crucial in evangelism.^[37] Zwemer’s God was glorious and all-encompassing: ‘never be satisfied with compromise or concessions’, demanding instead ‘unconditional surrender’.^[38]