Q. If I have a choice to take as a partner in a business a Jewish non-believer (apikores) investor or a religious catholic one, which one should I choose?
A. See question above. The Rema (O.H. 156: 1), quoted mentions that indeed some are lenient in regards to going into partnership with a religious Catholic. However, as mentioned above there are many details involved that have to be considered carefully, and each case is different.
Horav Shlomo Miller Shlit’a quoted the verse; (Mishlei 1: 15), “My son, do not go on the way with them; restrain your foot from their path.” He warned to be careful with our associations, since they tend to be very influential and can be rather detrimental and harmful.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a