Does Israeli withholding tax count as a credit against my home-country tax?

In most cases, yes. Most countries that have tax treaties with Israel (and many that do not) allow their residents to credit foreign taxes paid against their domestic tax liability on the same income. The exact mechanism depends on your home country's tax rules. For US persons, for example, Israeli withholding tax on dividends is generally creditable against US federal income tax on the same income. Confirm the position with a tax advisor in your home country.