Looking at your own religion and religious texts, see if there are passages in scripture that support your message directly. Engage people from said religions who care for the environment because they often do exist; being highly religious and spiritual can lead to self-transcendance and working for the benefit of the common good; caring for our environment is part of that given the challenges and dangers we face today. Finally, there are speakers from different religions who will advocate for change in their communities; seek them out and amplify them as part of a connected community. It is not all on you, and it is important to do your bit well so you can achieve meaningful change rather than 'greenwashing'. Good luck, it's a worthy goal