Sri Ramakrishna, the 19th century mystic monk, devotee of Goddess Kali and regarded as an incarnation of Shriman Narayana by His followers; was a well-known harmoniser of all paths and religions. He is said to have practiced Shaktism, Vaishnavism, Christianity and Sufism. One of His favourite quotes include:
I had to practise each religion for a time — Hinduism, Islām, Christianity. Furthermore, I followed the paths of the Śāktas, Vaishnavas, and Vedāntists. I realized that there is only one God toward whom all are travelling; but the paths are different.
However, my question is did Sri Ramakrishna ever indicate that one can practice multiple religions/paths at the same time? I'm aware that during Sri Ramakrishna's Sufi practice, He stopped visiting the Dakshineswar Kali temple room. Also, in the above quote, Sri Ramakrishna categorically states that He practiced multiple paths "for a time". Does this indicate multiple religions/paths cannot be followed at the same time. Does Swami Vivekananda say anything about this?