If you really love the person, the only thing is to be patient. Trust and faith in the Gods is not built easily, especially in those who are without and it is their first life coming across this religion.
If it is for one to be near the Gods, it will happen inevitably.
However, communication is extremely important in a relationship. You can tell your partner you want to let him know more about yourself, and bring this subject in if you believe he will want to listen.
If you believe he won't, don't put yourself in an uncomfortable situation, or even potential danger.
But if your partner really loves you, he would want to get to know you more, get to know your beliefs, and hear you talk passionately about how great the Gods are.
If you're in a healthy relationship, this will happen. But don't try to convince him it is the right way. He gets to decide which is the right way for him, you just show him a part of you that was too bright to be kept in the dark.
Coming from darkness, he might be blinded by the light, but his vision will adapt. For that, I say once again, to be patient. If it is meant for him to see, he will.