LOL. Might as well give up, because there is no way you'll win that argument. Most people know what you mean, that religion is based on faith and it is not something that one can definitively prove. But, some people think that statement only applies to other religions, not their own - and they will never concede such a thing.
I know, wheres that gif with the pounding his hands and head against his computer untill he’s bloody?
This is the case all across the religious spectrum.
If you are arguing that a specific religion has a specific practice that is noisome to them in the extreme, that can actually be dealt with openly in almost all cases ~ I used types of infant baptism, and the baptism of the dead.
Christianity has addressed the infant baptism over the centuries and some groups go out of their way to avoid drowning babies. Others just defer baptism until it may be done safely. Others do nothing.
Issue is still there. It gets discussed. Changes are made. No one's fundamental religious beliefs (revealed truths) are challenged. Baptisms proceed.
Whether you like it or not religion is to its practitioners a body of facts, so you'll just have to settle down and get along with religious people. They simply don't accept what you think as logic.
But that 'faith' WILL vanish when subjected to data that DISPROVES it!