Is there any mention of other religions in any Hindu text?
Yes, there is. In Veda itself there is a mantra that talks of people living on earth and speaking a variety of languages and having various religions.
The following mantra , found in the Atharva Veda, is a prayer to the all-supporting Earth, who supports everyone irrespective of the language they speak and the religion they follow.
Janam vibhrati vahudhA vivAchas (1) NAnAdharmAn prithvi (2) YathA
okasam (3) Sahasram dhArA dravinasya me duhAm (4) Dhruveva dhenuh
Earth has people who speak various tongues (1) and those who have
various religions (2), according to their places of abode (3). [ May
she, the Earth] pour for me treasures in a thousand streams (4), like
a constant Cow that never fails.
Atharva Veda 12.1.45
Note that, the mantra also mentions that religion will vary according to the places of abodes.