Personally, a lot of the left politics are anti-Christian, specifically in regards to abortion, same-sex marriage, and now gender identity.
On the areas of the poor and the environment, the teachings of Christ in those are directed at the individual. The care for the poor in the leftist tradition, is seen as a function of the State. While the true Christian view is that it is a function of the individual. We are to PERSONALLY help the poor, not simply vote to have someone’s money taken from them instead.
We can see that in the words of St. John Chrysostom, a Doctor of the Church
Should we look to kings and princes to put right the inequalities between rich and poor? Should we require soldiers to come and seize the rich person’s gold and distribute it among his destitute neighbors? Should we beg the emperor to impose a tax on the rich so great that it reduces them to the level of the poor and then to share the proceeds of that tax among everyone? Equality imposed by force would achieve nothing, and do much harm.
Those who combined both cruel hearts and sharp minds would soon find ways of making themselves rich again. Worse still, the rich whose gold was taken away would feel bitter and resentful; while the poor who received the gold from the hands of soldiers would feel no gratitude, because no generosity would have prompted the gift. Far from bringing moral benefit to society, it would actually do moral harm. Material justice cannot be accomplished by compulsion, a change of heart will not follow. The only way to achieve true justice is to change people’s hearts first – and then they will joyfully share their wealth.
Most of the left’s policies towards the poor run directly counter to the works of St John, and the end result is exactly what St John predicts, resentment on the part of the rich, and a lack of gratitude by the poor, with a total lack of any change of heart on either side.