The SGP differs from the Christian Heritage Party in that it restricts its membership to certain Reformed denominations , while Christian Heritage membership stood open to all evangelical Christians .
At first many of SGP 's office - holders had some association with the Reformed Churches .
The SGP differs from the Christian Heritage Party in that it restricts its membership to certain Reformed denominations , while Christian Heritage membership stood open to all evangelical Christians , although at first many of its office - holders had some association with the Reformed Churches .