My advice would be to try to connect to the person beyond their religion. You might never be able to relate with their beliefs as a Catholic, Anglican, Mormon, Sunni, Muslim, or Hindu, but if you're not willing to see an empathetic person under that religious belief then you're not contributing towards reconciliation between religious and non-religious communities.

I was a full-on Roman Catholic (pro-life and all sorts) before I met some friends in my late-teens who had very varying religious beliefs (50% atheist, otherwise a mix of Protestantism/Islam/Hinduism, who were in hindsight more accepting of my religious beliefs than I was of theirs.

I now consider myself atheist, and more healthy for it, but it arose 100% from people who loved me rather than people who criticised me for my religion.