Arguments against abortion are often put in the context of religion faith, making it a religious issue based on what you believe about God.
However, the issue is technically not about religion at all. Abortion concerns the intentional killing of another human being, and is similar to murder, meaning that it violates a basic human right to life that is outside of religious belief.
Pope Francis has spoken about this multiple times, such as this quote from 2019.
Scientific data on life inside the womb further cements this reality, proving that a human embryo is exactly that: a human.
The Sacred Congregation for the Doctrine of the Faith pointed this out back in 1974, in their Declaration on Procured Abortion.
Abortion violates the natural right to life of every human person. This isn't established by religion, but by our shared humanity.
If murder is wrong in our human community, than it must follow that abortion is in the same category.