The CAA does not discriminate against Muslims. The CAA only fasttracks persecuted minority groups for citizenship. If tomorrow, Myanmar is bought under the preview of the CAA, then Rohingyas will be fasttracked for citizenship under CAA too.
Nothing prevents the Muslims of Pakistan, Bangladesh and Afghanistan from applying for citizenship the normal way.
So for the last time, No, the CAA is not discriminatory. Other laws exist with the very same intention of the CAA like the American Lautenberg Amendment. The CAA provides a home to desperate people fleeing horrendous persecution. That's all. Nothing in it prohibits Muslims from seeking Indian citizenship in any form or manner.
If this answer still does not satisfy you, blow it out of your hole.