There is a large non-Jewish cemetery near where I live. It has beautiful grounds and is open to the public for visiting. Is it OK to pray or study Torah there?
It has been said that a Jew may visit the graves of righteous gentiles to arouse one to do Teshuvah when the graves of Jews are not available in one’s vicinity, but if the cemetery you wish to enter contains statues of idols (such as Christian crosses, etc.) then you should not enter such a cemetery let alone pray or learn there.