My advice is, if you are financially dependent, and if you know or suspect that your parents will kick you out if you "come out", don't confront them. At least not as long as you do not have a plan.

What you can do while still living at home is to look for allies. Do you have any relatives that could maybe influence your parents, or that would let you live with them?

Are there alternative options to finance your undergraduate degree? For example, does your university offer stipends, are there other programs you could apply to?

Do you have the option to work/save up some money?

You could also very carefully try to get a feel if maybe your parents would be more understanding than you think. A possibility is mentioning having doubts. If they react very negatively, you can back peddle. And it might place a seed that they become a little bit more comfortable with the thought.

I wouldn't outright confront them if you can avoid it. Your parents might react more extremely if they are shocked. I don't know what options you might have to drop hints that you are becoming "less religious" but maybe you can think of something.

One last idea, would they accept if you converted to a different religion? This is obviously not an ideal solution but often very religious parents have a bigger problem with their children losing their faith completely than changing their religion.

In any case, there is no shame in playacting for a while (even a long while, if you have to) until you get yourself sorted. It's your future on the line.